Topic 6 - Electromagnetic Waves

Question 1

List the EM spectrum in order of smallest to largest.

Answer 1

Radio Waves, Micro Waves, Infrared, Visible Light, Ultra Violet, X-rays, Gamma Rays

Question 2

What type of waves are EM waves?

Answer 2

Transverse

Question 3

How do EM waves work?

Answer 3

By transferring energy from the source to an absorber.

Question 4

How are EM waves generated?

Answer 4

Changes in atoms and their nuclei - an electron moves up energy levels and when it moves back down, it gives out energy in the from of EM waves.

Question 5

What happens when a metal aerial absorbs radio waves?

Answer 5

It creates AC which is the same frequency as the waves.

Question 6

Give a use for each EM wave. (Smallest to largest)

Answer 6

TV, Telecommunications, TV remotes, Sight, Sun tanning, Security, Cancer treatment.

Question 7

Which way does light bend when entering a more dense object?

Answer 7

Towards the normal line

Question 8

When are waves refracted?

Answer 8

When changing speed

Question 9

What two things occur when waves are refracted

Answer 9

They change direction and their wavelength decreases.

Question 10

What is radiation dose measured in?

Answer 10

Sieverts