Chapter 10 Heat Transfer

Question 1

a bimetallic strip is made up of two metals that ______ __ _________ _____ upon the same change in temperature

Answer 1

expand at different rates

Question 2

metals have ____ ________ ________ so it is a good conductor of ____

Answer 2

free electron movement , heat

Question 2

define conduction

Answer 2

it is the transfer of thermal energy without the physical movement of the medium in contact

Question 2

how does conduction work

Answer 2

particles at the heated end gain thermal energy and vibrate faster and these particles collide with their neighbouring particles and transfer energy to them till the particles at the cooler end also vibrate faster

Question 3

define conduction

Answer 3

it is the transfer of heat through a medium by the movement of fluid due to difference in density

Question 4

define radiation

Answer 4

radiation is the transfer of heat infrarared radiation

Question 5

black is a good ________ and good _______ but a bad _________

Answer 5

absorber , emitter , reflector

Question 5

white / silver is a good _________ but a bad ________ and a bad ________

Answer 5

reflector , emitter , absorber