Chapter 5 - EM Waves - Radiation

Question 1

What do all objects emit?

Answer 1

Infra-red radiation

Question 2

What do particles do as an object gets hotter?

Answer 2

The particles vibrate more as they have more energy

Question 3

What is absolute zero?

Answer 3

The temperature when the particles stop vibrating (0 kelvin or -273˚C)

Question 4

What happens to the amount of infra-red radiation emitted per second, the lower the temperature?

Answer 4

The lower the temperature, the lower the amount of infrared radiation emitted per second

Question 5

What colour absorbs infra-red radiation the best?

Answer 5

Black

Question 6

What colour emits infra-red radiation the best?

Answer 6

Black

Question 7

What finish absorbs infra-red radiation the best?

Answer 7

Matt

Question 8

What finish emits infra-red radiation the best?

Answer 8

Matt

Question 9

What can radiation cause?

Answer 9

Changes in atoms - some parts of EM spectrum can cause atoms to become ions

Question 10

What can changes in the nuclei of atoms produce?

Answer 10

Gamma radiation

Question 11

What can materials produce when they are heated?

Answer 11

Visible light or infra-red radiation

Question 12

Why is a car engine black?

Answer 12

Black is the colour that emits infra-red radiation the best, so emits the infra-red radiation produced by the engine, to cool it down