STP Waves and Rad 39 cards

Tagged as: astronomy, travel, nursing, economics, physics, music

 copy deck Copy deck

1

Complete the sentence 'electromagnetic radiation travels as'.

Waves and moves energy from one place to another.

2

What can be said about the speed of EM waves?

They all travel at the smae speed through a vacuum (space).

3

List the EM spectrum in order of increasing wavelength and decreasing frequency.

Gamma rays, X-rays, ultra violet rays visible light, infra red rays, microwaves and radio waves.


5

Which EM waves can be used communication?

Radio waves, microwaves, infra red waves and visible light.

6

What happens when EM radiation is absorbed by a substance?

The substance heats up and may create an a.c. current with the same frequency as radiation.


8

Give some uses of gamma rays.

Kill cancer, sterilise surgical instruments, kill harmful bacteria in food.

9

Give a use of X-rays.

Take radiographs to look for broken bones (the X-ray is absorbed by dense bone). Treat some cancers.