The document appears to be a chapter about sound from a textbook or study guide. It consists of multiple choice questions about various properties and behaviors of sound. Key points covered include:
- The types of sound waves humans can and cannot hear (infrasonic and ultrasonic).
- How sound travels through air via compressions and rarefactions.
- That the speed of sound varies with temperature but not amplitude or frequency.
- Common phenomena involving sound waves, such as reflection, refraction, resonance, interference, and beats.
- Applications of sound waves including echo location, medical ultrasound, and noise cancellation.
In this presentation, I explain what a standing wave on a string is, the difference between a standing wave and a travelling wave, and go over some practice problems.
Sound waves are produced by the vibration of material objects. A disturbance in the form of a longitudinal wave travels away from the vibrating source. High-pitched sounds are produced by sources vibrating at high frequency, while low-pitched sounds are produced by low-frequency sources Sound waves consist of traveling pulses of high-pressure zones, or compression, alternating with pulses of low-pressures zones, or rarefaction. Sound can travel through gases, liquids, and solid, but not through a vacuum.
In this presentation, I explain what a standing wave on a string is, the difference between a standing wave and a travelling wave, and go over some practice problems.
Sound waves are produced by the vibration of material objects. A disturbance in the form of a longitudinal wave travels away from the vibrating source. High-pitched sounds are produced by sources vibrating at high frequency, while low-pitched sounds are produced by low-frequency sources Sound waves consist of traveling pulses of high-pressure zones, or compression, alternating with pulses of low-pressures zones, or rarefaction. Sound can travel through gases, liquids, and solid, but not through a vacuum.
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Slide 1: Title Slide
Extrachromosomal Inheritance
Slide 2: Introduction to Extrachromosomal Inheritance
Definition: Extrachromosomal inheritance refers to the transmission of genetic material that is not found within the nucleus.
Key Components: Involves genes located in mitochondria, chloroplasts, and plasmids.
Slide 3: Mitochondrial Inheritance
Mitochondria: Organelles responsible for energy production.
Mitochondrial DNA (mtDNA): Circular DNA molecule found in mitochondria.
Inheritance Pattern: Maternally inherited, meaning it is passed from mothers to all their offspring.
Diseases: Examples include Leber’s hereditary optic neuropathy (LHON) and mitochondrial myopathy.
Slide 4: Chloroplast Inheritance
Chloroplasts: Organelles responsible for photosynthesis in plants.
Chloroplast DNA (cpDNA): Circular DNA molecule found in chloroplasts.
Inheritance Pattern: Often maternally inherited in most plants, but can vary in some species.
Examples: Variegation in plants, where leaf color patterns are determined by chloroplast DNA.
Slide 5: Plasmid Inheritance
Plasmids: Small, circular DNA molecules found in bacteria and some eukaryotes.
Features: Can carry antibiotic resistance genes and can be transferred between cells through processes like conjugation.
Significance: Important in biotechnology for gene cloning and genetic engineering.
Slide 6: Mechanisms of Extrachromosomal Inheritance
Non-Mendelian Patterns: Do not follow Mendel’s laws of inheritance.
Cytoplasmic Segregation: During cell division, organelles like mitochondria and chloroplasts are randomly distributed to daughter cells.
Heteroplasmy: Presence of more than one type of organellar genome within a cell, leading to variation in expression.
Slide 7: Examples of Extrachromosomal Inheritance
Four O’clock Plant (Mirabilis jalapa): Shows variegated leaves due to different cpDNA in leaf cells.
Petite Mutants in Yeast: Result from mutations in mitochondrial DNA affecting respiration.
Slide 8: Importance of Extrachromosomal Inheritance
Evolution: Provides insight into the evolution of eukaryotic cells.
Medicine: Understanding mitochondrial inheritance helps in diagnosing and treating mitochondrial diseases.
Agriculture: Chloroplast inheritance can be used in plant breeding and genetic modification.
Slide 9: Recent Research and Advances
Gene Editing: Techniques like CRISPR-Cas9 are being used to edit mitochondrial and chloroplast DNA.
Therapies: Development of mitochondrial replacement therapy (MRT) for preventing mitochondrial diseases.
Slide 10: Conclusion
Summary: Extrachromosomal inheritance involves the transmission of genetic material outside the nucleus and plays a crucial role in genetics, medicine, and biotechnology.
Future Directions: Continued research and technological advancements hold promise for new treatments and applications.
Slide 11: Questions and Discussion
Invite Audience: Open the floor for any questions or further discussion on the topic.
Seminar of U.V. Spectroscopy by SAMIR PANDASAMIR PANDA
Spectroscopy is a branch of science dealing the study of interaction of electromagnetic radiation with matter.
Ultraviolet-visible spectroscopy refers to absorption spectroscopy or reflect spectroscopy in the UV-VIS spectral region.
Ultraviolet-visible spectroscopy is an analytical method that can measure the amount of light received by the analyte.
Richard's entangled aventures in wonderlandRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
The increased availability of biomedical data, particularly in the public domain, offers the opportunity to better understand human health and to develop effective therapeutics for a wide range of unmet medical needs. However, data scientists remain stymied by the fact that data remain hard to find and to productively reuse because data and their metadata i) are wholly inaccessible, ii) are in non-standard or incompatible representations, iii) do not conform to community standards, and iv) have unclear or highly restricted terms and conditions that preclude legitimate reuse. These limitations require a rethink on data can be made machine and AI-ready - the key motivation behind the FAIR Guiding Principles. Concurrently, while recent efforts have explored the use of deep learning to fuse disparate data into predictive models for a wide range of biomedical applications, these models often fail even when the correct answer is already known, and fail to explain individual predictions in terms that data scientists can appreciate. These limitations suggest that new methods to produce practical artificial intelligence are still needed.
In this talk, I will discuss our work in (1) building an integrative knowledge infrastructure to prepare FAIR and "AI-ready" data and services along with (2) neurosymbolic AI methods to improve the quality of predictions and to generate plausible explanations. Attention is given to standards, platforms, and methods to wrangle knowledge into simple, but effective semantic and latent representations, and to make these available into standards-compliant and discoverable interfaces that can be used in model building, validation, and explanation. Our work, and those of others in the field, creates a baseline for building trustworthy and easy to deploy AI models in biomedicine.
Bio
Dr. Michel Dumontier is the Distinguished Professor of Data Science at Maastricht University, founder and executive director of the Institute of Data Science, and co-founder of the FAIR (Findable, Accessible, Interoperable and Reusable) data principles. His research explores socio-technological approaches for responsible discovery science, which includes collaborative multi-modal knowledge graphs, privacy-preserving distributed data mining, and AI methods for drug discovery and personalized medicine. His work is supported through the Dutch National Research Agenda, the Netherlands Organisation for Scientific Research, Horizon Europe, the European Open Science Cloud, the US National Institutes of Health, and a Marie-Curie Innovative Training Network. He is the editor-in-chief for the journal Data Science and is internationally recognized for his contributions in bioinformatics, biomedical informatics, and semantic technologies including ontologies and linked data.
Richard's aventures in two entangled wonderlandsRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
2. The sound waves that most humans
cannot hear are
a. infrasonic.
b. ultrasonic.
c. Both of these.
d. None of the above, for young people can hear
both.
3. The sound waves that most humans
cannot hear are
a. infrasonic.
b. ultrasonic.
c. Both of these.
d. None of the above, for young people can hear
both.
4. Sound travels in air by a series of
a. compressions.
b. rarefactions.
c. Both of these.
d. None of these.
5. Sound travels in air by a series of
a. compressions.
b. rarefactions.
c. Both of these.
d. None of these.
6. The vibrations set up in a radio
loudspeaker have the same frequencies
as the vibrations
a. in the electric signal feeding the loudspeaker.
b. that produce the sound you hear.
c. Both of these.
d. None of these.
7. The vibrations set up in a radio
loudspeaker have the same frequencies
as the vibrations
a. in the electric signal feeding the loudspeaker.
b. that produce the sound you hear.
c. Both of these.
d. None of these.
10. In which of these materials does
sound travel fastest?
a. Air
b. Water
c. Steel
d. All the same at the same temperature
11. In which of these materials does
sound travel fastest?
a. Air
b. Water
c. Steel
d. All the same at the same temperature
12. The speed of sound varies with
a. amplitude.
b. frequency.
c. temperature.
d. All of these.
13. The speed of sound varies with
a. amplitude.
b. frequency.
c. temperature.
d. All of these.
Explanation: Although loudness varies with amplitude, and pitch
varies with frequency, speed is not influenced by amplitude
nor frequency. A listener in the back row at a concert would
find music confusing if sound of different frequencies reached
the ear at different times.
14. The loudness of a sound is most
closely related to its
a. frequency.
b. period.
c. wavelength.
d. amplitude.
15. The loudness of a sound is most
closely related to its
a. frequency.
b. period.
c. wavelength.
d. amplitude.
16. Sound made to undergo reverberation
is sound that is
a. sympathetically vibrating.
b. varying in tone.
c. multiply reflected.
d. refracted.
17. Sound made to undergo reverberation
is sound that is
a. sympathetically vibrating.
b. varying in tone.
c. multiply reflected.
d. refracted.
18. When sound undergoes refraction, it
undergoes a change in
a. frequency.
b. wavelength.
c. speed.
d. intensity.
19. When sound undergoes refraction, it
undergoes a change in
a. frequency.
b. wavelength.
c. speed.
d. intensity.
20. Sound can NOT be
a. reflected.
b. absorbed.
c. diminished by interference.
d. None of these.
21. Sound can NOT be
a. reflected.
b. absorbed.
c. diminished by interference.
d. None of these.
Comment: Sound, like any wave, can undergo all of these!
22. Sensing an invisible object by way of
ultrasound is used by
a. bats.
b. dolphins
c. medical doctors.
d. All of these.
23. Sensing an invisible object by way of
ultrasound is used by
a. bats.
b. dolphins
c. medical doctors.
d. All of these.
24. Sound normally travels farther in air
when the sound is
a. low frequency.
b. high frequency.
c. resonant.
d. low in energy.
25. Sound normally travels farther in air
when the sound is
a. low frequency.
b. high frequency.
c. resonant.
d. low in energy.
Explanation: Hence the low tone of fog horns.
26. A factory floor vibrates, and as a result
you vibrate when standing on the floor.
This is
a. forced vibration.
b. resonance.
c. refraction.
d. diffraction.
27. A factory floor vibrates, and as a result
you vibrate when standing on the floor.
This is
a. forced vibration.
b. resonance.
c. refraction.
d. diffraction.
28. When you tap various objects, they
produce characteristic sounds that are
related to
a. wavelength.
b. amplitude.
c. period.
d. natural frequency.
29. When you tap various objects, they
produce characteristic sounds that are
related to
a. wavelength.
b. amplitude.
c. period.
d. natural frequency.
30. When the surface of a guitar is made
to vibrate, we say it undergoes
a. forced vibration.
b. resonance.
c. refraction.
d. amplitude enhancement.
31. When the surface of a guitar is made
to vibrate, we say it undergoes
a. forced vibration.
b. resonance.
c. refraction.
d. amplitude enhancement.
Comment: The sound may be enhanced, but it is the surface
of the guitar that undergoes forced vibration.
32. When an object is set vibrating by a
wave having a frequency that matches
the natural frequency of the object, what
occurs is
a. forced vibration.
b. resonance.
c. refraction.
d. amplitude enhancement.
33. When an object is set vibrating by a
wave having a frequency that matches
the natural frequency of the object, what
occurs is
a. forced vibration.
b. resonance.
c. refraction.
d. amplitude enhancement.
Comment: Resonance, rather than amplitude enhancement,
is the better answer.
34. Noise-canceling devices such as
jackhammer earphones make use of
sound
a. destruction.
b. interference.
c. resonance.
d. amplification.
35. Noise-canceling devices such as
jackhammer earphones make use of
sound
a. destruction.
b. interference.
c. resonance.
d. amplification.
36. The phenomenon of beats is the
result of sound
a. destruction.
b. interference.
c. resonance.
d. amplification.
37. The phenomenon of beats is the
result of sound
a. destruction.
b. interference.
c. resonance.
d. amplification.
38. When a 134-Hz tuning fork and a
144-Hz tuning fork are struck, the
beat frequency is
a. 2 Hz.
b. 6 Hz.
c. 8 Hz.
d. more than 8 Hz.
39. When a 134-Hz tuning fork and a
144-Hz tuning fork are struck, the
beat frequency is
a. 2 Hz.
b. 6 Hz.
c. 8 Hz.
d. more than 8 Hz.
Explanation: The beat frequency is the difference between
the two, 10 Hz (which is more than 8 Hz).
40. When your radio set is tuned to an
incoming radio signal, what occurs?
a. Forced vibration
b. Resonance
c. Refraction
d. Diffraction
41. When your radio set is tuned to an
incoming radio signal, what occurs?
a. Forced vibration
b. Resonance
c. Refraction
d. Diffraction