Which option is the best blackbody radiator?
1 answer:
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A. Hannah should choose copper for her pot because it has the lowest specific heat, and she should choose wood for her spoon because it has the highest specific heat
Explanation:
The specific heat capacity of a substance is the amount of heat required to increase the temperature of 1 kg of the substance by 1 degree.
Mathematically:
where
Q is the amount of heat supplied to the substance
m is the mass of the subtsance
is the increase in temperature
This means that:
- A substance with higher specific heat needs a lot of energy to raise its temperature
- A substance with higher specific heat needs a small amount of energy to increase its temperature
In this situation, we want:
- A material with low specific heat for the pot, because the pot must be able to transmit heat efficiently, so it must be able to become hot (=increase its temperature) with a small amount of heat
- A material with high specific heat for the spoon, so that the spoon does not become too hot too fast (because it takes a lot of energy to increase its temperature)
Therefore, the most reasonable choice in this situation is:
A. Hannah should choose copper for her pot because it has the lowest specific heat, and she should choose wood for her spoon because it has the highest specific heat
Learn more about specific heat:
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