Energy- Conduction & Radiation

Question 1

_______ are the best conductors with a ____ energy transfer and ___-_______ are insulators with a ___ energy transfer.

Answer 1

Metals are the best conductors with a high energy transfer and non-metals are insulators with a low energy transfer.

Question 2

Convection is the movement of ____ in ______. The _________ in the fluid become less
dense when hot, rise and float. When ____ the particles become denser and sink.

Answer 2

Convection is the movement of heat in fluids. The particles in the fluid become less
dense when hot, rise and float. When cold the particles become denser and sink.

Question 3

All hot objects radiate heat in the form of _____. There is no need for particles.

Answer 3

All hot objects radiate heat in the form of waves. There is no need for particles.

Question 4

Houses are _________ to prevent energy loss and save ______ _________ and _____.

Answer 4

Houses are insulated to prevent energy loss and save energy resources and money.

Question 5

Double glazing prevents heat loss because they have a trapped layer of ___ so both
___________ and ___________ cycles are disrupted.

Answer 5

Double glazing prevents heat loss because they have a trapped layer of gas so both
conduction and convection cycles are disrupted.

Question 6

Insulating panels are made of a foam and coated with foil, this reduces r_________,
c__________ and c___________.

Answer 6

Insulating panels are made of a foam and coated with foil, this reduces radiation,
conduction and convection.

Question 7

All objects ____ and ______ radiation, the hotter it is, the ____ it gives out.

Answer 7

All objects emit and absorb radiation, the hotter it is, the more it gives out.

Question 8

The earth’s temperature depends on r________ from the s__.

Answer 8

The earth’s temperature depends on radiation from the sun.

Question 9

__________ the number of layers of insulation _________ thermal transfer so the
temperature loss is less.

Answer 9

Increasing the number of layers of insulation decreases thermal transfer so the
temperature loss is less.

Question 10

Materials with trapped layers of ___ are good insulators because heat does not
transfer well between ______ and _____.

Answer 10

Materials with trapped layers of air are good insulators because heat does not
transfer well between solids and gases.