Energy Transfer Flashcards
1
Q
What does the rate of energy transfer depend on?
A
- The temperature difference across the material.
- The thickness of the material.
- The thermal conductivity.
2
Q
Is the infrared wavelength longer or shorter than VRL?
A
Longer.
3
Q
At a constant temperature, what is the rate of infrared radiation being absorbed and emitted?
A
It is absorbed and emitted at the same rate.
4
Q
As well as being the best absorbed, what is a black body also best at?
A
Emitting radiation.
5
Q
How does peak intensity change?
A
It increases with temperature.
6
Q
How is heat insulated in homes?
A
- Cavity wall insulation
- Loft insulation
- Double-glazing
- Aluminium foul behind radiators
- Thick bricks with low thermal conductivity
