2 - Energy transfer by heating Flashcards
1
Q
Better thermal conductivity equals…
A
More energy is transferred by the object per second.
2
Q
Constant temperature means…
A
The object is emitting infrared radiation at the same rate that it’s absorbing it.
3
Q
A perfect black body is…
A
An object that absorbs all radiation and doesn’t reflect or transmit any radiation. A perfect black body is the best absorber and emitter.
4
Q
As temp. increases, the intensity of radiation is…
A
greater with every wave length.
5
Q
The shorter the wavelength of radiation…
A
The greater the increase in intensity.
6
Q
How many joules of energy are required to heat 1kg of water by 1 C?
A
4200J
7
Q
Name some insulation methods.
A
Loft insulation - fibre glass Cavity wall insulation Aluminium foil between radiator and wall Double glazed windows Thicker bricks
