Uses And Dangers Of EM Waves

Question 1

What EM waves are generally safe?

Answer 1

Those at the lower frequency end of the spectrum eg radio waves

Question 2

Being exposed to too much radiation can be what?

Answer 2

Harmful

Question 3

Describe one use of Ultra Violet radiation

Answer 3

• security marking

- genuine bank notes where ink absorbs the UV and re-radiates visible light

Question 4

Name a danger of Gamma and X-rays

Answer 4

Because they have very high frequencies they are very dangerous.
They can cause cell damage which can lead to cancer

Question 5

Name a use for Radio Waves

Answer 5

Communications

Question 6

Name a use for Microwaves

Answer 6

Cooking or mobile phones

Question 7

Name a use of Infrared Radiation

Answer 7

Thermal imaging

Question 8

The hotter the object, the what?

Answer 8

More infra-red radiation it gives out

Question 9

What is infrared radiation also known as?

Answer 9

Heat radiation

Question 10

What EM waves tend to be the most dangerous?

Answer 10

The waves at the high frequency end of the spectrum eg gamma rays