Lesson 3
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Electromagnetic radiation can transfer energy and potentially damage living tissue depending on its frequency. Microwaves and certain other frequencies are capable of ionizing atoms by knocking off electrons, which can lead to cell mutation and cancer at high doses. Only high-energy photons like gamma rays, X-rays, and UV radiation have enough energy to cause ionization in materials.
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Electromagnetic waves are transverse waves that are produced by oscillating electric and magnetic fields. They can propagate through empty space and do not require a medium. As the electric field oscillates, it generates a changing magnetic field, and vice versa, with the fields perpendicular to each other and the direction of travel. All objects emit electromagnetic waves as a function of their temperature. The electromagnetic spectrum encompasses waves with different wavelengths and frequencies, from radio waves to gamma rays. Devices like radios, microwaves, MRI machines, and telescopes detect different parts of the spectrum.
C12-Electromagnetic_Waves.ppt
Electromagnetic waves are formed by vibrating electric charges and can transfer energy through space by vibrating electric and magnetic fields. They include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays. The electromagnetic spectrum orders these waves by increasing frequency and decreasing wavelength. Different parts of the spectrum interact with matter in different ways and have various applications including communication technologies like radio, television, cell phones and GPS.
C12-Electromagnetic_Waves.ppt
Electromagnetic waves are formed by vibrating electric charges and can transfer energy through space by vibrating electric and magnetic fields. They include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays. All objects emit EM waves depending on their temperature, and the waves have different properties depending on their frequency and wavelength. Radio communication systems like radio, television, cell phones and satellites transmit information by modulating EM carrier waves.
Electromagnetic Waves_Electromagnetic Waves_EM Waves
Electromagnetic waves are transverse waves that are produced by oscillating electric and magnetic fields. They can propagate through empty space and do not require a medium. As the frequency increases, the wavelength decreases. The electromagnetic spectrum encompasses all possible frequencies of electromagnetic waves, from radio waves to gamma rays. Different devices are used to detect various types of electromagnetic waves, like antennas for radio waves and infrared detectors for infrared waves.
C12-Electromagnetic_Waves.pptfsfsefefsfsef
Electromagnetic waves are transverse waves that are produced by oscillating electric and magnetic fields. They can propagate through empty space and do not require a medium. As the frequency increases, the wavelength decreases. The electromagnetic spectrum encompasses all possible frequencies of electromagnetic waves, from radio waves to gamma rays. Different devices are used to detect various types of electromagnetic waves, like antennas for radio waves and infrared detectors for infrared waves.
3.3 Electromagnetic Spectrum.pptx
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.
050316 week8 c12-electromagnetic_waves
Electromagnetic waves are formed by vibrating electric charges and can travel through space, transferring energy between electric and magnetic fields (1). They include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays, which make up the electromagnetic spectrum (2). Different parts of the spectrum interact with matter in different ways and have various applications like communication, imaging and heating (3).
Nature of Light
This document provides an overview of the nature of light. It begins by describing light as an electromagnetic wave that consists of vibrating electric and magnetic fields and does not require matter to travel through. It then discusses key characteristics of light, including its speed, the importance of light from the sun as an energy source, and the electromagnetic spectrum. The document proceeds to describe different types of electromagnetic waves, including radio waves, microwaves, infrared waves, visible light, ultraviolet light, x-rays, and gamma rays. It provides examples of uses for each type of wave and notes both beneficial and harmful effects of exposure.
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.
Electromagnetic waves
The document is a presentation about electromagnetic waves. It contains the following key points:
1. Electromagnetic waves include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays. They are classified based on wavelength and frequency.
2. All electromagnetic waves are transverse waves that travel at the speed of light and can be reflected, refracted, emitted or absorbed.
3. Different types of electromagnetic waves have various applications like radio for communication, infrared for night vision, visible light for sight, ultraviolet for sterilization, X-rays for medical imaging and gamma rays for cancer treatment.
4. Students are instructed to read the presentation, take an
Electromagnetic spectrum
The document discusses the electromagnetic spectrum, which is the entire range of electromagnetic radiation from gamma rays with the shortest wavelengths and highest frequencies to radio waves with the longest wavelengths and lowest frequencies. It notes that the electromagnetic spectrum includes gamma rays, X-rays, ultraviolet light, visible light, infrared radiation, radio waves, and microwaves. The document also provides information on what each part of the electromagnetic spectrum provides, such as radio waves creating images and microwaves being tuned to frequencies that can be absorbed by food.
electromagneticwaves-120829053329-phpapp02.pdf
1. This document discusses the electromagnetic spectrum, which includes electromagnetic waves ranging from radio waves to gamma rays. It describes the key properties and applications of different types of electromagnetic waves.
2. Students are instructed to read through the powerpoint presentation on electromagnetic waves and attempt an EM wave quiz within 60 minutes. The quiz grades will count towards their semester assessment.
3. The presentation covers the main components of the electromagnetic spectrum, the properties of all EM waves, and discusses the role and applications of different EM waves like radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Students are provided tips to remember the EM spectrum and visible light spectrum.
Electromagnetic spectrum
The electromagnetic spectrum describes the different types of electromagnetic radiation ranging from gamma rays to radio waves, with shorter wavelengths and higher frequencies being more powerful. It is defined as the continuum of all kinds of electric, magnetic, and visible radiation from gamma rays to long radio waves. The document discusses how each part of the electromagnetic spectrum provides energy to different applications like radio waves creating images, microwaves heating food, and x-rays generating medical images.
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Lesson 3
- 1. How is being inside a microwave oven like standing in a city street?
- 2. These places are bathed in electromagnetic radiation (the oven in microwaves, the street in radio waves from TV and radio stations, microwaves from mobile phones, UV from the Sun etc). How is being inside a microwave oven like standing in a city street?
- 3. Lesson 3 Hot Stuff
- 5. At one end of the electromagnetic spectrum are radio radiations. Radio photons carry little energy. radio VHF (radio) radio VLF radio UHF (TV) radio (AM radio)
- 6. Some types of electromagnetic radiation, if intense enough, have a noticeable warming effect.
- 7. Microwave radiation can be good at heating anything with water in it.
- 9. Gamma rays, X-rays, and UV are radiations that have the most energetic photons. UV X-ray gamma rays
- 10. Radiation is emitted and absorbed as photons. UV transfers energy to skin, but heating is not the only effect
- 11. All types of electromagnetic radiation travel as photons. They are packets of energy. absorbing molecule from source
- 12. Ionization happens when a photon with enough energy hits an atom or molecule inside a material. An individual collision between a photon and an atom can ionize the atom, if the photon is sufficiently energetic
- 13. UV radiation, X-rays, and gamma rays transfer energy to material in local and dramatic ways.
- 14. Ionisation When radiation collides with neutral atoms or molecules it alters their structure by knocking off electrons. This will leave behind IONS – this is called IONISING RADIATION. High energy radiation Electron
- 15. Ionisation Some types of radiation are dangerous because they “ionises” atoms – in other words, it turns them into ions by “knocking off” electrons: Ionisation causes cells in living tissue to mutate, usually causing cancer. High doses can destroy cells completely, causing radiation sickness. Radiation
- 16. Only radiations with high-energy photons can cause ionization. radio VLF radio VHF (radio) microwave infrared UV X-ray gamma rays cosmic rays radio UHF (TV) radio (AM radio) ionizing radiation non-ionizing radiation visible spectrum