Seeing colour - explaning Uv, IR and other radiation

8 important questions on Seeing colour - explaning Uv, IR and other radiation

What is the speed of light?

300 000 kilometers per second

Which waves have the longest wavelength?

radio waves , one metre or more. A radio wave can be more than a kilometre long.

At what length do microwaves start?

at one millimetre and can be up to one metre long.
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What waves can you detect with an ariel?

radio waves or microwaves

What is the most suitable length for an ariel?

it is about  one quater of a wavelength.

How long are the microwaves used for police walkie-talkies?

about 80 cm long, optimal length walkie-talkie is about 20 cm

Is it true that in a night club white clothing lights up due to additives in the washing-powder in which the clothing was washed?

yes

Does a fluorescent substance emit types of radiation that are not present in the light it absorbs?

yes

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