Ch 12 Electromagnetic Spectrum
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what is the speed of light in vacuum?
3x10^8 m/s
can you name one electromagnetic wave?
name any one:radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV), X-rays and gamma rays.
How are the electromagnetic waves arranged?
In order of increasing or decreasing wavelength or in order of increasing or decreasing frequency
Which wave has the longest wavelength?
radiowave
Which wave has the highest frequency?
gamma ray
which wave has the lowest frequency?
radiowaves
State all 7 components of the electromagnetic spectrum in increasing order of wavelength.
In this order: gamma rays, X-rays, ultraviolet, visible light, infrared, microwaves and radio waves.
State one application of radio waves.
radio and television communication to transmit sound and pictures
State one application of microwaves.
satellite communication, mobile phone network, cooking food in a microwave oven
State one application of infra-red.
used in thermal imaging cameras, surveillance system to detect intruders, transmit information in remote controls.
State one application of visible light.
used in lasers to cut through hard materials or weld metals together, allows humans to see
State one application of ultraviolet rays.
stimulates the body to produce vitamin D, sterilise surgical equipment, used in anti-forgery in currencies
State one application of X-rays.
used to examine hidden flaws and cracks in metal welding, inspection of luggage in airports, examine the condition of a person’s bones
State one application of gamma rays.
used to kill cancerous cells, sterilise hospital equipment, check flaws in metal