DP Physics (first assessment 2025)

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Question 19M.2.HL.TZ2.10d

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.2.HL.TZ2.10d
Level HL Paper 2 Time zone TZ2
Command term Suggest Question number d Adapted from N/A
d.
[Maximum mark: 2]
19M.2.HL.TZ2.10d
(d)

Suggest why this cycle is not a suitable model for a working heat pump.

[2]

Markscheme

the temperature changes in the cycle are too large ✔

the cycle takes too long «because it contains an isothermal stage» ✔

energy/power output would be too small ✔

Examiners report

Because the question was about a heat pump rather than a heat engine very few answers were correct. Only a very small number of candidates mentioned the fact that the isothermal change would take an impracticably long time.

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