Rate Of Heat Transfer

Question 1

The bigger the surface area the more..

Answer 1

Infrared waves can be emitted and absorbed from/by the surface

Question 2

So the bigger the surface area the quicker

Answer 2

The heat transfer

Question 3

What are heat sinks designed to do?

Answer 3

To transfer heat away from objects they’re in contact with

Question 4

Why if the two objects at the same temperature the same surface area but different volumes would the smaller volume cool quicker?

Answer 4

Because a higher proportion of the object will b in contact with its surroundings.

Question 5

Objects made from good conductors transfer heat away………Than a insulator

Answer 5

Quickly

Question 6

The glass bottle is double walled with a vacuum what does it stop escaping?

Answer 6

Heat through conduction and convection escaping

Question 7

The walls either side of the vacuum are silvered to stop….

Answer 7

Heat through radiation escaping

Question 8

The bottle is supported by insulating foam. This stops..

Answer 8

Heat escaping through conduction

Question 9

The stopper stops Heat escaping through by

Answer 9

Conduction

Question 10

Why do the hairs on our skin stand up when it is cold?

Answer 10

To trap a thicker layer of insulating air around the body this limits heat loss by convection

Question 11

Why when you get to warm does the body divert more blood to flow nearer the top of your skin?

Answer 11

So that Heat can be lost through radiation- that’s why you go pink

Question 12

Animals in cold climates have …. Ears than those in hot countries to help control heat transfer

Answer 12

Smaller

Question 13

What is heat energy radiated from?

Answer 13

The surface of the object.