3.4 Energy Transfer by Radiation

Question 1

What is infra-red radiation?

Answer 1

It is part of the electromagnetic spectrum and it can be emitted, absorbed, or reflected.

Question 2

What does it mean when an object absorbs infra-red radiation?

Answer 2

It means that the object will heat up as it gains energy.

Question 3

What does it mean when an object emits infra-red radiation?

Answer 3

It means it will cool down as it loses energy.

Question 4

What does it mean when an object reflects infra-red radiation?

Answer 4

It means there is no change in the temperature and the object hasn’t lost or gained energy.

Question 5

What type of object will emit infra-red radiation more rapidly? Hot Object or Cool Object?

Answer 5

Hot Object

Question 6

What colors are the best emitters and absorbers of infra-red radiation?

Answer 6

Dark Colors

Question 7

What colors are the worst emitters and absorbers of infra-red radiation?

Answer 7

Light Colors