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Dtu10e clicker ch02
The document contains multiple choice questions about planetary motion and astronomy concepts from Chapter 2 of the textbook. The questions cover topics like retrograde motion of planets, shapes of orbits, phases of Venus, planetary configurations, Kepler's laws of planetary motion, and units of measurement like light years. One question asks students to explain the difference between mass and weight.
15 clicker questions
The document contains multiple choice questions about concepts related to temperature, heat, and thermal expansion. Specifically, it covers topics like molecular motion and temperature, definitions of heat and internal energy, specific heat capacity, phase changes of water, and thermal expansion of materials. Each question is followed by an explanation of the correct answer.
24 clicker questions
This document contains a series of multiple choice questions about magnetism and magnetic fields. The questions cover topics such as the interaction between magnetic poles, the source of magnetism, magnetic forces, magnetic domains, and applications of magnetism like electric meters and the Earth's magnetic field.
26 clicker questions
- The document contains multiple choice questions about properties of light from a chapter on light.
- It addresses topics like what light is composed of, the electromagnetic spectrum, reflection and absorption of light, and properties of vision.
- The questions are accompanied by explanations and comments about correct answers.
28 clicker questions
The document contains a series of multiple choice questions about concepts related to light reflection, refraction, lenses, and the human eye. Each question is followed by an explanation of the correct answer. Key concepts covered include how light travels in a straight line, reflection of light at surfaces, mirror images, refraction of light through different mediums, dispersion of light by prisms, rainbow formation, lenses and the eye.
27 clicker questions
The document contains multiple choice questions about color and light. It addresses topics like how color depends on the frequency of light, how objects appear certain colors based on reflecting or absorbing wavelengths of light, how overlapping primary colors can produce other colors, and how atmospheric scattering contributes to the colors we see in nature like the blue sky and sunsets. The questions assess understanding of color addition, complementary colors, and how color is perceived in things like printed materials and ocean water.
28 lecture outline
This lecture outline covers the topics of reflection, refraction, dispersion, and rainbows. Reflection is when light returns to the medium it came from, following the law that the angle of incidence equals the angle of reflection. Refraction is when light changes speed and bends when moving between media, causing illusions. Dispersion is the separation of white light into colors by prisms and raindrops, causing rainbows which appear as colored arcs due to the refraction and reflection of sunlight in raindrops.
Recommended
Dtu10e clicker ch02
The document contains multiple choice questions about planetary motion and astronomy concepts from Chapter 2 of the textbook. The questions cover topics like retrograde motion of planets, shapes of orbits, phases of Venus, planetary configurations, Kepler's laws of planetary motion, and units of measurement like light years. One question asks students to explain the difference between mass and weight.
15 clicker questions
The document contains multiple choice questions about concepts related to temperature, heat, and thermal expansion. Specifically, it covers topics like molecular motion and temperature, definitions of heat and internal energy, specific heat capacity, phase changes of water, and thermal expansion of materials. Each question is followed by an explanation of the correct answer.
24 clicker questions
This document contains a series of multiple choice questions about magnetism and magnetic fields. The questions cover topics such as the interaction between magnetic poles, the source of magnetism, magnetic forces, magnetic domains, and applications of magnetism like electric meters and the Earth's magnetic field.
26 clicker questions
- The document contains multiple choice questions about properties of light from a chapter on light.
- It addresses topics like what light is composed of, the electromagnetic spectrum, reflection and absorption of light, and properties of vision.
- The questions are accompanied by explanations and comments about correct answers.
28 clicker questions
The document contains a series of multiple choice questions about concepts related to light reflection, refraction, lenses, and the human eye. Each question is followed by an explanation of the correct answer. Key concepts covered include how light travels in a straight line, reflection of light at surfaces, mirror images, refraction of light through different mediums, dispersion of light by prisms, rainbow formation, lenses and the eye.
27 clicker questions
The document contains multiple choice questions about color and light. It addresses topics like how color depends on the frequency of light, how objects appear certain colors based on reflecting or absorbing wavelengths of light, how overlapping primary colors can produce other colors, and how atmospheric scattering contributes to the colors we see in nature like the blue sky and sunsets. The questions assess understanding of color addition, complementary colors, and how color is perceived in things like printed materials and ocean water.
28 lecture outline
This lecture outline covers the topics of reflection, refraction, dispersion, and rainbows. Reflection is when light returns to the medium it came from, following the law that the angle of incidence equals the angle of reflection. Refraction is when light changes speed and bends when moving between media, causing illusions. Dispersion is the separation of white light into colors by prisms and raindrops, causing rainbows which appear as colored arcs due to the refraction and reflection of sunlight in raindrops.
17 clicker questions
The document contains multiple choice questions about phase changes and the energy transfers that occur during processes like evaporation, condensation, freezing, boiling, and sublimation. Specifically, it addresses how the molecules in water behave during evaporation, how temperature is affected by the condensation and evaporation of water in the air, and how energy is absorbed or released when substances change phase between solid, liquid, and gas states.
07 review clickers
This document contains multiple choice questions and answers about planets and other objects in our solar system. It covers topics like the composition of terrestrial and Jovian planets, where asteroids and comets come from, and models used to represent scale distances in the solar system. The questions are part of a chapter review for an astronomy textbook on the structure and composition of bodies orbiting our Sun.
25 clicker questions
1) The document contains multiple choice questions about electromagnetic induction and related concepts like transformers.
2) Key concepts covered include Faraday's law of induction, how changing magnetic fields can induce currents and voltages in conductors, the workings of motors, generators and transformers, and Maxwell's generalization of electromagnetic induction.
3) The questions are accompanied by explanations of the answers to reinforce understanding of these fundamental electromagnetic concepts.
23 clicker questions
This document contains multiple choice questions about electric circuits and current. It addresses topics like the flow of electric charge in circuits, factors that influence current, components of electric current, differences between direct and alternating current, and ways to prevent overloading circuits. The questions are from a chapter about electric current and cover foundational concepts in introductory electricity.
09 lecture outline
This lecture outline covers key concepts of gravity including Newton's universal law of gravity, the inverse square law, gravitational fields, weight and weightlessness, ocean tides, black holes, and Einstein's theory of gravitation. The key topics are explained through definitions, equations, diagrams, and examples.
11 lecture outline 2
This lecture outline covers the atomic nature of matter, including:
- The atomic hypothesis that all matter is made of atoms.
- Characteristics of atoms such as being incredibly tiny, numerous, and perpetually in motion.
- Atomic structure including the nucleus and subatomic particles.
- The elements, periodic table, isotopes, compounds, and molecules.
- Antimatter, which has the opposite charge of normal matter.
- Dark matter, which comprises about 23% of the universe.
Cosmology CSUDH Telescopes
This document summarizes a chapter about telescopes. It discusses how telescopes work by focusing light using lenses or mirrors. The two most important properties of telescopes are their light-collecting area and angular resolution. There are two basic designs: refracting telescopes use lenses while reflecting telescopes use mirrors. Astronomers use telescopes to take images, perform spectroscopy, and monitor light over time. Earth's atmosphere limits ground-based observations so many telescopes are placed in space. Telescopes observe different wavelengths of light by modifying their designs. Multiple telescopes can work together using interferometry to achieve very high angular resolution.
Cosmology CSUDH
The document summarizes key concepts from Chapter 5 of a textbook on light and matter. It discusses:
1) How light interacts with matter through emission, absorption, transmission, reflection and scattering. Interactions determine the appearance of objects.
2) Properties of light including its wave-particle duality and behavior. The electromagnetic spectrum is introduced.
3) Structure and phases of matter. Atoms store energy in distinct levels and matter changes form with temperature and pressure through phase transitions.
4) Spectra provide information about compositions and properties. Emission, absorption and continuous spectra reveal the atoms and molecules present, and temperatures of cosmic objects.
24 clicker questions
This document contains a series of multiple choice questions about magnetism and magnetic fields. The questions cover topics such as the interaction between magnetic poles, the source of magnetism, magnetic forces, magnetic domains, and applications of magnetism like electric meters and the Earth's magnetic field.
24 lecture outline
This lecture outline covers various topics related to magnetism including magnetic forces, poles, fields, domains, electric currents and magnetic fields, electromagnets, magnetic forces on moving charges and current-carrying wires, Earth's magnetic field, and biomagnetism. Key concepts include how magnets have north and south poles that attract or repel, how magnetic fields are produced by electron motion, how electromagnets are made stronger by increasing current or coil turns, and how moving charges are deflected by magnetic fields.
S2 review clickers
The document appears to be a series of multiple choice questions about concepts in special relativity from Einstein's theory. Some of the key ideas addressed include: that motion is relative and there is no absolute frame of reference; the constancy of the speed of light for all observers; time dilation and length contraction for objects moving at relativistic speeds; and that mass increases with speed approaching the speed of light, making it impossible for objects with mass to reach the speed of light.
S2 lecture outline
Special relativity revolutionized our understanding of space and time by showing that they are relative rather than absolute. Key ideas include:
- No object can exceed the speed of light, and the speed of light is the same in all reference frames.
- Time passes more slowly and lengths contract for objects in motion, with dramatic effects near light speed.
- Simultaneity of events depends on one's perspective; time and space are relative rather than absolute concepts.
22 clicker questions
This document contains multiple choice questions about electrostatics and concepts such as charge, electric fields, voltage, and capacitors. It tests understanding of fundamental properties like how the net charge of an atom is determined by its protons and electrons, how the strength of the electric force between particles increases as they are brought closer together, and that capacitors can store both charge and energy.
22 lecture outline
This document outlines a lecture on electrostatics. It will cover electrical forces and charges, conservation of charge, Coulomb's law, conductors and insulators, superconductors, charging, charge polarization, electric field, electric potential, and electric energy storage. Key concepts include that opposite charges attract and like charges repel, Coulomb's law describes the relationship between electrical force and charge, conductors allow electron flow while insulators do not, and capacitors can store electrical energy between charged plates.
14 review clickers
The document contains multiple choice questions and answers about key concepts regarding the Sun from Chapter 14 of The Cosmic Perspective textbook. Specifically, it addresses questions about why the Sun shines, the conditions required for nuclear fusion, how photons move from the Sun's core to its surface, the solar activity cycle, and how solar activity affects Earth.
14 lecture outline
The Sun shines through nuclear fusion in its core. The core is hot and dense enough for hydrogen to fuse into helium via the proton-proton chain reaction. This nuclear fusion releases energy that gradually makes its way to the surface and radiates into space, powering the Sun for billions of years. We know about the Sun's interior structure from mathematical models, observations of solar vibrations, and detections of solar neutrinos. Solar activity like sunspots and solar flares are caused by magnetic fields in the Sun. Bursts of particles from solar activity can disrupt power grids and satellites orbiting Earth. The 11-year solar cycle is due to changes in the Sun's magnetic field over time.
19 clicker questions
This document contains multiple choice questions about waves and vibrations. It covers topics like the definitions of vibration, wave, frequency, period, wavelength, amplitude. It also discusses different types of waves like transverse waves, longitudinal waves, standing waves and how their vibrations and speeds work. Interference, Doppler effect, shock waves and sonic booms are also summarized. The document tests the reader's understanding of key wave concepts through multiple choice practice questions.
19 lecture outline 3
This chapter discusses vibrations, waves, and wave properties. It defines a vibration as a periodic motion in time and a wave as a periodic motion in both space and time. It describes transverse waves, which have oscillations perpendicular to the direction of travel, and longitudinal waves, which have oscillations parallel to travel. Key wave properties discussed include wavelength, frequency, period, amplitude, and speed. The chapter also covers topics like wave interference, standing waves, and the Doppler effect.
13 review clickers
This document contains multiple choice questions and answers about detecting exoplanets. It discusses how the Doppler shift method detects planets by looking for periodic red-blue shifts in the spectrum of the star being orbited. Space telescopes are needed to image planets directly and detect transits, as a planet passing in front of its star will cause periodic dimming events in the star's brightness. Current missions aim to find smaller, Earth-sized planets using these detection methods.
13 lecture outline
Future observations will improve our understanding of extrasolar planetary systems in three key ways:
1) Transit missions like Kepler will find Earth-like planets by detecting the small brightness decreases caused when planets cross in front of their stars.
2) Astrometric missions such as GAIA will precisely measure the wobbles of stars caused by the gravitational tugs of orbiting Earth-mass planets.
3) Direct detection missions will use techniques like adaptive optics and starlight blocking to directly image Earth-like planets, which are currently too faint to see next to their bright host stars.
15 clicker questions
The document contains multiple choice questions about concepts related to temperature, heat, and thermal expansion. Specifically, it covers topics like molecular motion and temperature, definitions of heat and internal energy, specific heat capacity, phase changes of water, and thermal expansion of materials. Each question is followed by an explanation of the correct answer.
15 lecture outline
This lecture discusses temperature, heat, specific heat capacity, and thermal expansion. It defines temperature as a measure of average kinetic energy of particles, and heat as the transfer of internal energy between objects due to a temperature difference. Specific heat capacity is the amount of heat required to change an object's temperature, and differs between materials. Thermal expansion occurs when the increased motion of particles upon heating causes most materials to expand in volume.
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17 clicker questions
The document contains multiple choice questions about phase changes and the energy transfers that occur during processes like evaporation, condensation, freezing, boiling, and sublimation. Specifically, it addresses how the molecules in water behave during evaporation, how temperature is affected by the condensation and evaporation of water in the air, and how energy is absorbed or released when substances change phase between solid, liquid, and gas states.
07 review clickers
This document contains multiple choice questions and answers about planets and other objects in our solar system. It covers topics like the composition of terrestrial and Jovian planets, where asteroids and comets come from, and models used to represent scale distances in the solar system. The questions are part of a chapter review for an astronomy textbook on the structure and composition of bodies orbiting our Sun.
25 clicker questions
1) The document contains multiple choice questions about electromagnetic induction and related concepts like transformers.
2) Key concepts covered include Faraday's law of induction, how changing magnetic fields can induce currents and voltages in conductors, the workings of motors, generators and transformers, and Maxwell's generalization of electromagnetic induction.
3) The questions are accompanied by explanations of the answers to reinforce understanding of these fundamental electromagnetic concepts.
23 clicker questions
This document contains multiple choice questions about electric circuits and current. It addresses topics like the flow of electric charge in circuits, factors that influence current, components of electric current, differences between direct and alternating current, and ways to prevent overloading circuits. The questions are from a chapter about electric current and cover foundational concepts in introductory electricity.
09 lecture outline
This lecture outline covers key concepts of gravity including Newton's universal law of gravity, the inverse square law, gravitational fields, weight and weightlessness, ocean tides, black holes, and Einstein's theory of gravitation. The key topics are explained through definitions, equations, diagrams, and examples.
11 lecture outline 2
This lecture outline covers the atomic nature of matter, including:
- The atomic hypothesis that all matter is made of atoms.
- Characteristics of atoms such as being incredibly tiny, numerous, and perpetually in motion.
- Atomic structure including the nucleus and subatomic particles.
- The elements, periodic table, isotopes, compounds, and molecules.
- Antimatter, which has the opposite charge of normal matter.
- Dark matter, which comprises about 23% of the universe.
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Cosmology CSUDH Telescopes
This document summarizes a chapter about telescopes. It discusses how telescopes work by focusing light using lenses or mirrors. The two most important properties of telescopes are their light-collecting area and angular resolution. There are two basic designs: refracting telescopes use lenses while reflecting telescopes use mirrors. Astronomers use telescopes to take images, perform spectroscopy, and monitor light over time. Earth's atmosphere limits ground-based observations so many telescopes are placed in space. Telescopes observe different wavelengths of light by modifying their designs. Multiple telescopes can work together using interferometry to achieve very high angular resolution.
Cosmology CSUDH
The document summarizes key concepts from Chapter 5 of a textbook on light and matter. It discusses:
1) How light interacts with matter through emission, absorption, transmission, reflection and scattering. Interactions determine the appearance of objects.
2) Properties of light including its wave-particle duality and behavior. The electromagnetic spectrum is introduced.
3) Structure and phases of matter. Atoms store energy in distinct levels and matter changes form with temperature and pressure through phase transitions.
4) Spectra provide information about compositions and properties. Emission, absorption and continuous spectra reveal the atoms and molecules present, and temperatures of cosmic objects.
24 clicker questions
This document contains a series of multiple choice questions about magnetism and magnetic fields. The questions cover topics such as the interaction between magnetic poles, the source of magnetism, magnetic forces, magnetic domains, and applications of magnetism like electric meters and the Earth's magnetic field.
24 lecture outline
This lecture outline covers various topics related to magnetism including magnetic forces, poles, fields, domains, electric currents and magnetic fields, electromagnets, magnetic forces on moving charges and current-carrying wires, Earth's magnetic field, and biomagnetism. Key concepts include how magnets have north and south poles that attract or repel, how magnetic fields are produced by electron motion, how electromagnets are made stronger by increasing current or coil turns, and how moving charges are deflected by magnetic fields.
S2 review clickers
The document appears to be a series of multiple choice questions about concepts in special relativity from Einstein's theory. Some of the key ideas addressed include: that motion is relative and there is no absolute frame of reference; the constancy of the speed of light for all observers; time dilation and length contraction for objects moving at relativistic speeds; and that mass increases with speed approaching the speed of light, making it impossible for objects with mass to reach the speed of light.
S2 lecture outline
Special relativity revolutionized our understanding of space and time by showing that they are relative rather than absolute. Key ideas include:
- No object can exceed the speed of light, and the speed of light is the same in all reference frames.
- Time passes more slowly and lengths contract for objects in motion, with dramatic effects near light speed.
- Simultaneity of events depends on one's perspective; time and space are relative rather than absolute concepts.
22 clicker questions
This document contains multiple choice questions about electrostatics and concepts such as charge, electric fields, voltage, and capacitors. It tests understanding of fundamental properties like how the net charge of an atom is determined by its protons and electrons, how the strength of the electric force between particles increases as they are brought closer together, and that capacitors can store both charge and energy.
22 lecture outline
This document outlines a lecture on electrostatics. It will cover electrical forces and charges, conservation of charge, Coulomb's law, conductors and insulators, superconductors, charging, charge polarization, electric field, electric potential, and electric energy storage. Key concepts include that opposite charges attract and like charges repel, Coulomb's law describes the relationship between electrical force and charge, conductors allow electron flow while insulators do not, and capacitors can store electrical energy between charged plates.
14 review clickers
The document contains multiple choice questions and answers about key concepts regarding the Sun from Chapter 14 of The Cosmic Perspective textbook. Specifically, it addresses questions about why the Sun shines, the conditions required for nuclear fusion, how photons move from the Sun's core to its surface, the solar activity cycle, and how solar activity affects Earth.
14 lecture outline
The Sun shines through nuclear fusion in its core. The core is hot and dense enough for hydrogen to fuse into helium via the proton-proton chain reaction. This nuclear fusion releases energy that gradually makes its way to the surface and radiates into space, powering the Sun for billions of years. We know about the Sun's interior structure from mathematical models, observations of solar vibrations, and detections of solar neutrinos. Solar activity like sunspots and solar flares are caused by magnetic fields in the Sun. Bursts of particles from solar activity can disrupt power grids and satellites orbiting Earth. The 11-year solar cycle is due to changes in the Sun's magnetic field over time.
19 clicker questions
This document contains multiple choice questions about waves and vibrations. It covers topics like the definitions of vibration, wave, frequency, period, wavelength, amplitude. It also discusses different types of waves like transverse waves, longitudinal waves, standing waves and how their vibrations and speeds work. Interference, Doppler effect, shock waves and sonic booms are also summarized. The document tests the reader's understanding of key wave concepts through multiple choice practice questions.
19 lecture outline 3
This chapter discusses vibrations, waves, and wave properties. It defines a vibration as a periodic motion in time and a wave as a periodic motion in both space and time. It describes transverse waves, which have oscillations perpendicular to the direction of travel, and longitudinal waves, which have oscillations parallel to travel. Key wave properties discussed include wavelength, frequency, period, amplitude, and speed. The chapter also covers topics like wave interference, standing waves, and the Doppler effect.
13 review clickers
This document contains multiple choice questions and answers about detecting exoplanets. It discusses how the Doppler shift method detects planets by looking for periodic red-blue shifts in the spectrum of the star being orbited. Space telescopes are needed to image planets directly and detect transits, as a planet passing in front of its star will cause periodic dimming events in the star's brightness. Current missions aim to find smaller, Earth-sized planets using these detection methods.
13 lecture outline
Future observations will improve our understanding of extrasolar planetary systems in three key ways:
1) Transit missions like Kepler will find Earth-like planets by detecting the small brightness decreases caused when planets cross in front of their stars.
2) Astrometric missions such as GAIA will precisely measure the wobbles of stars caused by the gravitational tugs of orbiting Earth-mass planets.
3) Direct detection missions will use techniques like adaptive optics and starlight blocking to directly image Earth-like planets, which are currently too faint to see next to their bright host stars.
15 clicker questions
The document contains multiple choice questions about concepts related to temperature, heat, and thermal expansion. Specifically, it covers topics like molecular motion and temperature, definitions of heat and internal energy, specific heat capacity, phase changes of water, and thermal expansion of materials. Each question is followed by an explanation of the correct answer.
15 lecture outline
This lecture discusses temperature, heat, specific heat capacity, and thermal expansion. It defines temperature as a measure of average kinetic energy of particles, and heat as the transfer of internal energy between objects due to a temperature difference. Specific heat capacity is the amount of heat required to change an object's temperature, and differs between materials. Thermal expansion occurs when the increased motion of particles upon heating causes most materials to expand in volume.
12 review clickers
The document contains multiple choice questions about asteroids, comets, and dwarf planets from Chapter 12 of The Cosmic Perspective textbook. It covers topics such as the composition and orbits of asteroids and comets, meteorites, comet tails, meteor showers, and the Kuiper Belt. The questions test understanding of key concepts about small solar system bodies like where they form, what they are made of, how their orbits behave, and potential discoveries.
06 review clickers_cooney
This document contains a series of multiple choice questions about telescopes and astronomical observation. The questions cover topics like the basic functioning of reflecting and refracting telescopes, the advantages of larger telescope size and space-based telescopes, interferometry techniques, and common instruments attached to telescopes.
06 lecture outline
Telescopes allow astronomers to observe the universe in different wavelengths of light. Ground-based telescopes are limited by Earth's atmosphere, so many telescopes have been placed in space. There are two main types of telescopes - refracting telescopes which use lenses and reflecting telescopes which use mirrors. Multiple telescopes can work together using interferometry to achieve the resolution of a larger single telescope. Astronomers use telescopes to take images of celestial objects, perform spectroscopy to analyze light, and monitor changes over time.
04 reading quiz clickers
This document contains a chapter reading quiz on motion, energy, and gravity. It includes multiple choice questions about describing and analyzing motion, Newton's laws of motion, conservation laws in astronomy including momentum and energy, and Newton's universal law of gravitation. It aims to test the reader's understanding of key concepts discussed in Chapter 4.
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Signatures of wave erosion in Titan’s coasts
The shorelines of Titan’s hydrocarbon seas trace flooded erosional landforms such as river valleys; however, it isunclear whether coastal erosion has subsequently altered these shorelines. Spacecraft observations and theo-retical models suggest that wind may cause waves to form on Titan’s seas, potentially driving coastal erosion,but the observational evidence of waves is indirect, and the processes affecting shoreline evolution on Titanremain unknown. No widely accepted framework exists for using shoreline morphology to quantitatively dis-cern coastal erosion mechanisms, even on Earth, where the dominant mechanisms are known. We combinelandscape evolution models with measurements of shoreline shape on Earth to characterize how differentcoastal erosion mechanisms affect shoreline morphology. Applying this framework to Titan, we find that theshorelines of Titan’s seas are most consistent with flooded landscapes that subsequently have been eroded bywaves, rather than a uniform erosional process or no coastal erosion, particularly if wave growth saturates atfetch lengths of tens of kilometers.
Discovery of An Apparent Red, High-Velocity Type Ia Supernova at 𝐳 = 2.9 wi...
We present the JWST discovery of SN 2023adsy, a transient object located in a host galaxy JADES-GS
+
53.13485
−
27.82088
with a host spectroscopic redshift of
2.903
±
0.007
. The transient was identified in deep James Webb Space Telescope (JWST)/NIRCam imaging from the JWST Advanced Deep Extragalactic Survey (JADES) program. Photometric and spectroscopic followup with NIRCam and NIRSpec, respectively, confirm the redshift and yield UV-NIR light-curve, NIR color, and spectroscopic information all consistent with a Type Ia classification. Despite its classification as a likely SN Ia, SN 2023adsy is both fairly red (
�
(
�
−
�
)
∼
0.9
) despite a host galaxy with low-extinction and has a high Ca II velocity (
19
,
000
±
2
,
000
km/s) compared to the general population of SNe Ia. While these characteristics are consistent with some Ca-rich SNe Ia, particularly SN 2016hnk, SN 2023adsy is intrinsically brighter than the low-
�
Ca-rich population. Although such an object is too red for any low-
�
cosmological sample, we apply a fiducial standardization approach to SN 2023adsy and find that the SN 2023adsy luminosity distance measurement is in excellent agreement (
≲
1
�
) with
Λ
CDM. Therefore unlike low-
�
Ca-rich SNe Ia, SN 2023adsy is standardizable and gives no indication that SN Ia standardized luminosities change significantly with redshift. A larger sample of distant SNe Ia is required to determine if SN Ia population characteristics at high-
�
truly diverge from their low-
�
counterparts, and to confirm that standardized luminosities nevertheless remain constant with redshift.
(June 12, 2024) Webinar: Development of PET theranostics targeting the molecu...
(June 12, 2024) Webinar: Development of PET theranostics targeting the molecu...Scintica Instrumentation
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Candidate young stellar objects in the S-cluster: Kinematic analysis of a sub...
Context. The observation of several L-band emission sources in the S cluster has led to a rich discussion of their nature. However, a definitive answer to the classification of the dusty objects requires an explanation for the detection of compact Doppler-shifted Brγ emission. The ionized hydrogen in combination with the observation of mid-infrared L-band continuum emission suggests that most of these sources are embedded in a dusty envelope. These embedded sources are part of the S-cluster, and their relationship to the S-stars is still under debate. To date, the question of the origin of these two populations has been vague, although all explanations favor migration processes for the individual cluster members. Aims. This work revisits the S-cluster and its dusty members orbiting the supermassive black hole SgrA* on bound Keplerian orbits from a kinematic perspective. The aim is to explore the Keplerian parameters for patterns that might imply a nonrandom distribution of the sample. Additionally, various analytical aspects are considered to address the nature of the dusty sources. Methods. Based on the photometric analysis, we estimated the individual H−K and K−L colors for the source sample and compared the results to known cluster members. The classification revealed a noticeable contrast between the S-stars and the dusty sources. To fit the flux-density distribution, we utilized the radiative transfer code HYPERION and implemented a young stellar object Class I model. We obtained the position angle from the Keplerian fit results; additionally, we analyzed the distribution of the inclinations and the longitudes of the ascending node. Results. The colors of the dusty sources suggest a stellar nature consistent with the spectral energy distribution in the near and midinfrared domains. Furthermore, the evaporation timescales of dusty and gaseous clumps in the vicinity of SgrA* are much shorter ( 2yr) than the epochs covered by the observations (≈15yr). In addition to the strong evidence for the stellar classification of the D-sources, we also find a clear disk-like pattern following the arrangements of S-stars proposed in the literature. Furthermore, we find a global intrinsic inclination for all dusty sources of 60 ± 20◦, implying a common formation process. Conclusions. The pattern of the dusty sources manifested in the distribution of the position angles, inclinations, and longitudes of the ascending node strongly suggests two different scenarios: the main-sequence stars and the dusty stellar S-cluster sources share a common formation history or migrated with a similar formation channel in the vicinity of SgrA*. Alternatively, the gravitational influence of SgrA* in combination with a massive perturber, such as a putative intermediate mass black hole in the IRS 13 cluster, forces the dusty objects and S-stars to follow a particular orbital arrangement. Key words. stars: black holes– stars: formation– Galaxy: center– galaxies: star formation
Evidence of Jet Activity from the Secondary Black Hole in the OJ 287 Binary S...
Wereport the study of a huge optical intraday flare on 2021 November 12 at 2 a.m. UT in the blazar OJ287. In the binary black hole model, it is associated with an impact of the secondary black hole on the accretion disk of the primary. Our multifrequency observing campaign was set up to search for such a signature of the impact based on a prediction made 8 yr earlier. The first I-band results of the flare have already been reported by Kishore et al. (2024). Here we combine these data with our monitoring in the R-band. There is a big change in the R–I spectral index by 1.0 ±0.1 between the normal background and the flare, suggesting a new component of radiation. The polarization variation during the rise of the flare suggests the same. The limits on the source size place it most reasonably in the jet of the secondary BH. We then ask why we have not seen this phenomenon before. We show that OJ287 was never before observed with sufficient sensitivity on the night when the flare should have happened according to the binary model. We also study the probability that this flare is just an oversized example of intraday variability using the Krakow data set of intense monitoring between 2015 and 2023. We find that the occurrence of a flare of this size and rapidity is unlikely. In machine-readable Tables 1 and 2, we give the full orbit-linked historical light curve of OJ287 as well as the dense monitoring sample of Krakow.
Anti-Universe And Emergent Gravity and the Dark Universe
Recent theoretical progress indicates that spacetime and gravity emerge together from the entanglement structure of an underlying microscopic theory. These ideas are best understood in Anti-de Sitter space, where they rely on the area law for entanglement entropy. The extension to de Sitter space requires taking into account the entropy and temperature associated with the cosmological horizon. Using insights from string theory, black hole physics and quantum information theory we argue that the positive dark energy leads to a thermal volume law contribution to the entropy that overtakes the area law precisely at the cosmological horizon. Due to the competition between area and volume law entanglement the microscopic de Sitter states do not thermalise at sub-Hubble scales: they exhibit memory effects in the form of an entropy displacement caused by matter. The emergent laws of gravity contain an additional ‘dark’ gravitational force describing the ‘elastic’ response due to the entropy displacement. We derive an estimate of the strength of this extra force in terms of the baryonic mass, Newton’s constant and the Hubble acceleration scale a0 = cH0, and provide evidence for the fact that this additional ‘dark gravity force’ explains the observed phenomena in galaxies and clusters currently attributed to dark matter.
The cost of acquiring information by natural selection
This is a short talk that I gave at the Banff International Research Station workshop on Modeling and Theory in Population Biology. The idea is to try to understand how the burden of natural selection relates to the amount of information that selection puts into the genome.
It's based on the first part of this research paper:
The cost of information acquisition by natural selection
Ryan Seamus McGee, Olivia Kosterlitz, Artem Kaznatcheev, Benjamin Kerr, Carl T. Bergstrom
bioRxiv 2022.07.02.498577; doi: https://doi.org/10.1101/2022.07.02.498577
Pests of Storage_Identification_Dr.UPR.pdf
InIndia-post-harvestlosses-unscientificstorage,insects,rodents,micro-organismsetc.,accountforabout10percentoftotalfoodgrains
Graininfestation
Directdamage
Indirectly
•theexuviae,skin,deadinsects
•theirexcretawhichmakefoodunfitforhumanconsumption
About600speciesofinsectshavebeenassociatedwithstoredgrainproducts
100speciesofinsectpestsofstoredproductscauseeconomiclosses
BIRDS DIVERSITY OF SOOTEA BISWANATH ASSAM.ppt.pptx
Ahota Beel, nestled in Sootea Biswanath Assam , is celebrated for its extraordinary diversity of bird species. This wetland sanctuary supports a myriad of avian residents and migrants alike. Visitors can admire the elegant flights of migratory species such as the Northern Pintail and Eurasian Wigeon, alongside resident birds including the Asian Openbill and Pheasant-tailed Jacana. With its tranquil scenery and varied habitats, Ahota Beel offers a perfect haven for birdwatchers to appreciate and study the vibrant birdlife that thrives in this natural refuge.
Male reproduction physiology by Suyash Garg .pptx
Physiology of Male reproduction.
Video mentioned at page no. 23 as summary for better understanding
Compexometric titration/Chelatorphy titration/chelating titration
Classification
Metal ion ion indicators
Masking and demasking reagents
Estimation of Magnisium sulphate
Calcium gluconate
Complexometric Titration/ chelatometry titration/chelating titration, introduction, Types-
1.Direct Titration
2.Back Titration
3.Replacement Titration
4.Indirect Titration
Masking agent, Demasking agents
formation of complex
comparition between masking and demasking agents,
Indicators/Metal ion indicators/ Metallochromic indicators/pM indicators,
Visual Technique,PM indicators (metallochromic), Indicators of pH, Redox Indicators
Instrumental Techniques-Photometry
Potentiometry
Miscellaneous methods.
Complex titration with EDTA.
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