Physics (AS & A Level) · Oct / Nov 2016 · Paper 11 · Question 20
9702The first law of thermodynamics
Which condition must apply for the work done by an expanding gas to be pΔV, where p is the pressure of the gas and ΔV is its change in volume?
- ANo thermal energy must be supplied to the gas.
- BThe expansion must be at a constant rate.
- CThe pressure must be constant.
- DThe temperature of the gas must be constant.
As printed in the paper
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Correct answer: C. The pressure must be constant.
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