Fichas
Physics: Chapter 13: Light: part 2: Electromagnetic Waves
Fichas del conjunto (30)
- 1What is a rainbow?A spectrum formed when sunlight is dispersed by raindrops
- 2What is Dispersion?The separation of white light into a spectrum of colors.
- 3What is Monochromatic?Light that has a single frequency
eg: a lazer light - 4What is the order of the visible light spectrum from the lowest frequency to the highest frequency/ shortest wavelength.Red, orange, yellow, green, blue, indigo, violet.
Red - lowest frequency and longest wavelength
Violet - shortest wavelength and highest frequency. - 5What are the properties of all electromagnetic waves? 5Travel at the speed of light = 3 * 10(8)
Don't need a medium to travel through - can travel through a vacuum.
Can transfer energy
Are produced by particles oscillating or losing energy in some way
Are transverse waves. - 6What are the 7 waves in the electromagnetic spectrum?Gamma Rays
X-ras
Ultra-violet
Visible Light
Infra-red
Microwaves
Radio Waves - 7What is the order of the electromagnetic spectrum from the waves with the lowest frequency and highest wavelength?Radio waves
Microwaves
Infra-red
Visible Light
Ultra-violet
X-rays
Gamma Rays - 8What type of wave are electromagnetic waves?Transverse
- 9Which ray carries the most amount of energy?Gamma Rays
- 10What are the uses of Gama Waves?Medical imaging, therapy, astronomy, food preservation/ steralisation
- 11What are the Risks of Gama Rays?Extremely penetrating and damaging to living tissues and cells.
- 12What are the uses of X-rays?Low energy - medical and industrial imaging
High Energy - treat cancer
Also - security purposes ie detecting weapons. - 13What are the risks of X-rays? What are the precautions used?Highly ionising (can damage body cells), even in low doses can cause cancer.
Precautions - exposure to minimum - place material to shield. - 14What are the uses of Ultraviolet?Medical and forensic photography, air purification, disinfection and medical therapy. Can be used to detect fake bank notes.
Pigments in high visibility cycling jackets - 15What is the frequency of Ultraviolet?Frequency over 20,000Hz
- 16What are the Risks of Ultraviolet?Too much - skin burns - cancer and cataract formations in the eye.
- 17What are the uses of Infra-red Radiation?Tv controllers, thermal imaging, security purposes eg intruder alarms by detecting body heat, electrical heaters.
- 18What are the risks of Infra-red Radiation?Can cause serious skin burns if emitted from high intensity sources.
- 19What are the uses of Microwaves?Satellite television - salellite communications, phone mast to phone, microwaves, cooking food
- 20How do microwaves work?The waves are absorbed by water, heating it in the process - create heat - useful for cooking as food has a lot of water.
- 21What are the Risks and precautions of Microwaves?Risks - Can have harmful effects on humans as largely made of water - internal heating of body tissues.
Precautions - Reduce expose - put shield between eg microwaves have microwave oven. - 22What are the uses of Radio waves?Radio and TV communications
- 23What are the risks of Radio Waves?At high intensity can cause internal heating of living tissue and potential harmful effects.
- 24Which is denser? Glass or air?Glass is more dense than air.
- 25What are Longitude waves?Particles of the medium vibrate in the same direction as the wave travels eg sound waves.
- 26What are Transverse waves?Particles of the medium vibrate at right angles to the direction of the waves motion. All electromagnetic waves are transverse waves.
- 27What does an emitter send?Pulses of high frequency and sound waves
- 28How do you calculate distance? not speed timeDepth * time
- 29What does the depth =?half the distance
- 30What do seismic waves only travel through? What type of wave are they?Solids - transverse waves
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- (Physics) GCSE Science Fichas sobre Physics: Chapter 13: Light: part 2: Electromagnetic Waves, creado por HRYN red el 18/06/2020.
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- HRYN red · jun 2020
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