Physics (AS & A Level) · May / June 2016 · Paper 11 · Question 16

Some gas in a cylinder is supplied with thermal energy q. The gas does useful work in expanding at constant pressure p from volume V0 to volume VF, as shown. [diagram of gas in a cylinder with volume V0 and volume VF, gas pressure p] Which expression gives the efficiency of this change?

1. A\frac{pV_0}{q}
2. B\frac{V_F}{V_0 q}
3. C\frac{p(V_F - V_0)}{q}
4. D\frac{(V_F - V_0)}{V_0 q}

As printed in the paper