P2. Energy Transfer By Heating

Question 1

What are the best conductors of thermal energy?

Answer 1

Metalllll

Question 2

What are the best insulators of thermal energy?

Answer 2

Non metals such as wood and fibreglass

Question 3

The higher the thermal conductivity of a material, the…

Answer 3

Higher the rate of energy transfer through the material

Question 4

Will a thick layer of insulating material have a low or high rate of energy transfer through it?

Answer 4

Low

Question 5

Why do materials that trap air have low thermal conductivities?

Answer 5

Air is a poor thermal conductor

Question 6

What is specific heat capacity of a substance?

Answer 6

The amount of energy needed to change the temperature of 1kg of the substance by 1 c

Question 7

If an object has a large mass, will the temperature increase be slower or faster?

Answer 7

Slower

Question 8

How can the rate of energy transfer be reduced? (5)

Answer 8

Loft insulation, cavity wall insulation, double glazed windows, aluminium foil behind radiators and having external walls built with thicker bricks

Question 9

Why are pipes that contain the water in solar heating panel often painted water?

Answer 9

Black surfaces are good absorbers of infrared radiation