energy transfer by heating

Question 1

thermal conductors

Answer 1

materials that allow thermal energy to move through them easily (metals)

Question 2

thermal insulators

Answer 2

materials that do not allow thermal energy to move through them easily

Question 3

rate of thermal energy transfer depends on…

Answer 3

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

Question 4

to reduce the rate of thermal energy transfer…

Answer 4

• have as low a thermal conductivity as possible
• be as thick as possible

Question 5

infrared waves

Answer 5

part of the electromagnetic spectrum

Question 6

perfect black body

Answer 6

an object that absorbs all the radiation that hits it

Question 7

temp of earth depends on…

Answer 7

• the rate at which the radiation from the sun is reflected or absorbed by the earths atmosphere and the earths surface.
• the rate at which radiation is emitted from the earths surface and from the earths atmosphere, into space

Question 8

specific heat capacity

Answer 8

the energy required to raise the temperature of 1kg of an object by 1degree celsius

Question 9

types of insulation

Answer 9

• fibreglass- the roof
• cavity wall insulation- outer walls
  -aluminium foil- reflects infrared radiation back into rooms
  -double glazing- windows
  -thick bricks- exterior walls