P2

Question 1

What does the energy transfer per second through a layer of insulating material depend on?

Answer 1

• the temperature difference across the material
• the thickness of the material
• the thermal conductivity if the material

Question 2

What can be done to reduce energy transfer in any given situation?

Answer 2

• the thermal conductivity of the material should be as low as possible
• the thickness if the insulating layer should be as thick as is practically possible

Question 3

What is black body radiation?

Answer 3

An object that absorbs 100% of the radiation that hits it and none is reflected

Question 4

How does an increase in temperature of a body effect the wavelength of the infrared radiation given off?

Answer 4

Increase in wavelength

Question 5

What happens to the infrared radiation when the temperature increases?

Answer 5

More infrared radiation is emitted in a given time

Question 6

What happens to the radiation that is emitted when an object has a constant temperature?

Answer 6

An object that has a constant temperature emits radiation across a continuous range of wavelengths