Electromagnetic spectrum
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This document defines and provides examples of the different types of electromagnetic waves: radio waves have the longest wavelengths, microwaves have shorter wavelengths than radio waves, infrared waves are shorter than radio waves but not visible to the human eye, visible light is the range of wavelengths visible to humans, ultraviolet rays have shorter wavelengths than visible light, x-rays have shorter wavelengths than ultraviolet rays, and gamma rays have the shortest wavelengths. Examples of uses for each type are also included, such as using radio waves for walkie talkies, microwaves for heating food, infrared for night vision, visible light forming rainbows, ultraviolet causing sunburn, x-rays being used in medical imaging, and gamma rays being emitted from
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Lecture6 sep23-bb (1)
1. The sun emits radiation across the electromagnetic spectrum, with most energy emitted in the visible, ultraviolet, and infrared regions. Around 50% of the sun's energy is emitted in the visible region.
2. All objects that have a temperature above absolute zero emit electromagnetic radiation according to their temperature. Wien's law states that objects emit the most radiation at a wavelength inversely proportional to their temperature.
3. The sun's peak emission wavelength is around 500nm, the earth's is around 10,000nm, and a human's is around 9,400nm. Blackbody radiation curves describe the emission spectra of objects at different temperatures.
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This document provides an overview of the characteristics, classifications, motions, and significance of stars. It discusses their sizes, colors, temperatures, compositions, and magnitudes. Stars are classified based on their spectral types, which relate to their surface temperatures. The Hertzsprung-Russell diagram plots stars' luminosities and temperatures. Stars exhibit both apparent and actual motions, including proper motion across the sky. Studying stars helps us understand how elements are formed, how our solar system evolved, and the dynamics influencing galaxies.
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Eukaryotic and prokaryotic cells differ in their nuclear structure and cell division processes. Eukaryotic cells have a membrane-bound nucleus containing chromosomes and a nucleolus, while prokaryotic cells lack a membrane-bound nucleus and nucleolus. Eukaryotic cells divide their nucleus through mitosis and may undergo meiosis, whereas prokaryotic cells usually divide their nucleoid through binary fission without mitosis or meiosis.
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Electromagnetic waves have different wavelengths and frequencies. They range from radio waves with the longest wavelengths and lowest frequencies to gamma rays with the shortest wavelengths and highest frequencies. All electromagnetic waves travel at the same speed of 300,000,000 meters/second in a vacuum. The higher the frequency, the higher the energy of the electromagnetic wave. Examples are given of how different electromagnetic waves are used such as radio waves for communication, microwaves for cooking, infrared for night vision, visible light for sight, ultraviolet for sterilization, x-rays for medical imaging, and gamma rays for radiation therapy.
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This document provides an introduction to electromagnetic waves and antennas. It defines a wave as an oscillation that transfers energy through space and time. Electromagnetic waves are created by combining electric and magnetic fields and do not require a medium to travel. Key properties of electromagnetic waves include frequency, wavelength, and velocity. The document then discusses different areas of the electromagnetic spectrum from radio waves to gamma rays. It provides examples of applications for different types of electromagnetic radiation. The document concludes by defining antennas as devices used for radiating or receiving electromagnetic waves and discussing different types of transmission lines like coaxial cables, microstrips, and striplines.
Light
Light can be described as both a wave and a particle. As a wave, it travels at 300 million meters per second and is characterized by its wavelength and frequency. The different wavelengths of light make up the electromagnetic spectrum, from radio waves to gamma rays. As the frequency increases, so does the energy of the electromagnetic waves. Light also behaves as particles called photons, which are emitted or absorbed in specific wavelengths by electrons in atoms. This allows spectroscopy to be used to determine the composition of different objects by their emission or absorption spectra.
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This document discusses the different types of electromagnetic radiation, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. It provides details on the wavelength ranges and frequencies for each type of electromagnetic wave. Radio waves are generated artificially and used for communications. Microwaves have wavelengths between 1 meter and 1 millimeter. Infrared is invisible to humans but we can feel it as heat. The visible spectrum is what the human eye can see, ranging from 390 to 700 nanometers. Ultraviolet has a shorter wavelength than visible light but longer than X-rays. X-rays have wavelengths between 0.01 to 10 nanometers. Gamma rays are the most energetic form of electromagnetic
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A. Electromagnetic waves travel as vibrations in electric and magnetic fields at the speed of light in a vacuum. They have properties of both waves and particles.
B. The electromagnetic spectrum orders electromagnetic waves from radio to gamma rays based on increasing frequency and decreasing wavelength. It includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
C. Each type of electromagnetic wave has different applications including global positioning systems, microwave ovens, night vision goggles, visible light, sunbathing, medical imaging, and nuclear power.
Electromagnetic spectrum.ppt
Electromagnetic waves travel as vibrations in electric and magnetic fields and include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. They are arranged in order of increasing frequency and decreasing wavelength in the electromagnetic spectrum. Electromagnetic waves have various properties including speed, frequency, wavelength, and energy level, with higher frequency waves having higher energy. Different types of electromagnetic waves are used for various applications such as communication technologies, cooking, medical imaging, sterilization, and radiation therapy.
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Wireless communication transfers information between devices without a physical connection using electromagnetic waves across the electromagnetic spectrum. Wireless signals are transmitted using antennas and received by antennas connected to other devices. The electromagnetic spectrum ranges from long radio waves to short gamma rays, with different frequencies and wavelengths used for different wireless technologies. Common uses of the electromagnetic spectrum include radio, GPS, WiFi, radiation therapy, and X-rays.
LIGHT.pptx
Light is a form of energy that behaves as both a particle and wave, traveling at 300 million meters per second. The electromagnetic spectrum describes the entire range of light, from radio waves to gamma rays, most of which is invisible to humans. The electromagnetic spectrum includes radio waves, microwaves, infrared light, visible light, ultraviolet light, X-rays, and gamma rays, all of which are used for various applications from cooking to medical imaging to astronomy.
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The document discusses the electromagnetic spectrum. It describes how electromagnetic waves can be classified based on their frequency and wavelength into different types of radiation including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Each type of electromagnetic radiation has distinct characteristics and common uses. For example, radio waves are used to transmit audio and television signals, microwaves are used in radar and microwave ovens, and X-rays are used in medical imaging. The document also discusses hypotheses about dark matter particles called axions and the possibility of detecting gamma ray bursts from supernovae that could provide evidence about the nature of dark matter.
ELECTROMAGNETIC WAVES.pptx
Electromagnetic waves are transverse waves that are created by oscillating electric and magnetic fields. They exhibit properties of reflection, refraction, and energy transfer. Electromagnetic waves vary in wavelength from long radio waves to very short gamma rays, with shorter wavelengths corresponding to higher energy. The electromagnetic spectrum maps all electromagnetic waves according to their frequency and wavelength, ranging from radio to gamma rays. Examples of uses of different electromagnetic waves include communication with radio waves, cooking with microwaves, infrared for TV remotes, visible light, ultraviolet from the sun, x-rays for medical imaging, and gamma rays for cancer treatment.
Electro magnetic waves
Electromagnetic waves are transverse waves that consist of oscillating electric and magnetic fields and propagate through space carrying energy. They include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays differing in wavelength and frequency. Electromagnetic waves travel at the speed of light and have both electric and magnetic field properties. Common applications of different types of electromagnetic waves include using radio waves for communication, microwaves for cooking, visible light for sight, ultraviolet light for sterilization, X-rays for medical imaging, and gamma rays for radiation treatment.
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A. Electromagnetic waves travel as vibrations in electrical and magnetic fields at the speed of light without a medium. They have properties of both waves and particles.
B. The electromagnetic spectrum orders electromagnetic waves from radio waves to gamma rays based on increasing frequency and decreasing wavelength. Different electromagnetic waves are used for technologies like WiFi, infrared devices, MRI, and X-rays.
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About electromagnetic spectrum and waves. Relationship between Wavelength, Frequency, and Energy.
How frequency changes with wavelength. Visible Spectrum, Radio waves, Infra-Red, Ultra Violet, Gama Rays, etc.
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A. Electromagnetic waves travel as vibrations in electrical and magnetic fields and can travel through empty space at the speed of light.
B. The electromagnetic spectrum orders electromagnetic waves from radio waves to gamma rays based on increasing frequency and decreasing wavelength.
C. Electromagnetic waves have both wave-like properties, such as the ability to refract and diffract, as well as particle-like properties seen in the photoelectric effect.
electromagnetic spectrum.ppt
A. Electromagnetic waves travel as vibrations in electrical and magnetic fields and can travel through empty space at the speed of light.
B. The electromagnetic spectrum orders electromagnetic waves from radio waves to gamma rays based on increasing frequency and decreasing wavelength.
C. Electromagnetic waves have both wave-like properties, such as the ability to refract and diffract, as well as particle-like properties seen in the photoelectric effect.
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A. Electromagnetic waves travel as vibrations in electrical and magnetic fields and can travel through empty space at the speed of light.
B. The electromagnetic spectrum orders electromagnetic waves from radio waves to gamma rays based on increasing frequency and decreasing wavelength.
C. Electromagnetic waves have both wave-like properties, such as the ability to refract and diffract, as well as particle-like properties seen in the photoelectric effect.
electromagnetic spectrum.ppt
Electromagnetic radiation spans a broad range of wavelengths and frequencies known as the electromagnetic spectrum. It includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Each region has a characteristic range of wavelengths and frequencies, and different applications such as communications, heating, vision, industrial processes, and medical treatments.
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This document discusses properties of x-rays. It notes that x-rays have wavelengths between 0.01 to 10 nanometers and frequencies of about 1019 Hz. X-rays are produced when a beam of electrons is reflected off metal like tungsten. X-rays have medical and industrial applications like radiography for medical diagnosis and testing products for defects. Radiography can also be used to examine paintings and reveal details. The document distinguishes between hard and soft x-rays based on energy levels.
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The document describes the electromagnetic spectrum and different types of electromagnetic waves. It states that all electromagnetic waves travel at the speed of light and discusses the key properties and uses of radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. The document also notes that electromagnetic waves with shorter wavelengths carry more energy and can be ionizing, while longer wavelength waves are generally non-ionizing but can still cause heating effects in tissues.
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The document discusses the electromagnetic spectrum, which consists of radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays, and gamma rays. Each type of electromagnetic wave has a different wavelength and frequency, with radio waves having the longest wavelengths and lowest frequencies, and gamma rays having the shortest wavelengths and highest frequencies. Examples are given for how each type of electromagnetic wave is used, such as radios using radio waves, cell towers transmitting microwaves, heat lamps emitting infrared waves, stars emitting visible light, black lights using ultraviolet waves, X-rays being used to see broken bones, and neutron stars emitting gamma rays.
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The document describes different types of electromagnetic waves:
- Radio waves have the longest wavelengths and lowest frequencies, and are used for devices like walkie talkies and radios.
- Microwaves have shorter wavelengths than radio waves and are used in devices like radar guns and microwave ovens. Radar guns use microwaves to detect speeding vehicles.
- Electromagnetic waves include radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays, and gamma rays, each with different wavelengths and frequencies.
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Radio waves have the lowest frequency and are used for communication, microwaves have a higher frequency than radio waves and are used for cooking food and radar, visible light is the only part of the electromagnetic spectrum that humans can see with the naked eye.
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Radio waves have the longest wavelengths and lowest frequencies, and are used by televisions and radios to receive signals. Microwaves have slightly shorter wavelengths than radio waves. Infrared waves have wavelengths shorter than radio waves but longer than visible light, and are used to heat objects as they are absorbed by cameras to create thermograms. Visible light has the perfect wavelengths and frequencies to be seen by the human eye and makes up the rainbow. Ultraviolet light has shorter wavelengths than visible light and causes things to glow purple. X-rays have wavelengths just shorter than ultraviolet light and can pass through soft tissues but not hard tissues like bone. Gamma rays have the shortest wavelengths and highest frequencies and are released by supernovas and nuclear
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An inactive volcano that becomes active again is called dormant. When pressure builds in the mantle or tectonic plates move, a dormant volcano can erupt. The 1883 eruption of Krakatoa in Indonesia lasted 3 days, killed over 36,000 people, and destroyed villages. It was one of the largest eruptions in history, sending ash over 840 km away. The 1991 eruption of Mount Pinatubo in the Philippines was also extremely large, causing over $1 billion in damage and lowering the global temperature for years by ejecting over 1 cubic mile of ash and gases high into the atmosphere.
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The document summarizes several earthquakes and volcanic eruptions caused by tectonic plate movement. The 1906 San Francisco earthquake killed over 700 people and left 225,000 homeless, with $400 million in damages. If a similar quake were to occur today, it could kill more due to the increased population. The 1960 Chile earthquake was caused by two plates sliding, generating an 11.5 meter tsunami that destroyed homes within two miles of the coast and caused damage across the Pacific. Mount Vesuvius's eruption was triggered by plate collision, burying Pompeii under 20 miles of ash and killing 2,000 residents, destroying the civilization.
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The document summarizes information about two volcanic eruptions: Pompeii and Mount Pinatubo. For Pompeii, it describes how the eruption was caused by a tear in the African tectonic plate that allowed magma to rise. It killed an estimated 20,000 people within 13 miles and destroyed properties. Society slowly recovered as Pompeii became a tourist site. For Mount Pinatubo, a series of earthquakes led to its 1991 eruption, the largest of the 20th century. It killed 847 people directly and more from disease, displaced over 1 million, and caused extensive economic damages. Recovery took decades as infrastructure was rebuilt.
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Electromagnetic spectrum
- 2. Definition: Electromagnetic wave with the longest wavelengths and the lowest frequency. (diagram of radio waves) (walky talkys use radio waves)
- 3. A radio wave that has the shortest wavelength and longest frequencies. (Microwaves are used to heat food) (use radar gun to track speed)
- 4. Electromagnetic waves with wavelength shorter then those of radio waves. (animals pics infrared) (heat lamp example of infrared waves)
- 5. Electromagnetic waves that are visible to the human eye. (visible light) (a rainbow is visible light)
- 6. Definition: Electromagnetic waves with wavelengths shorter than visible light but shorter then x-rays. (sun burn) (galaxy UV)
- 7. Electromagnetic waves with wavelengths shorter than Ultraviolet rays, but longer than then Gamma rays. (x-rays) (x-ray machine)
- 8. Electromagnetic waves with the shortest wavelengths and the highest frequencies. (mediceine) (star burst)