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Question 22M.1.SL.TZ1.28

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1.SL.TZ1.28
Level SL Paper 1 Time zone TZ1
Command term Question number 28 Adapted from N/A
28.
[Maximum mark: 1]
22M.1.SL.TZ1.28

Wind of speed v flows through a wind generator. The wind speed drops to v3 after passing through the blades. What is the maximum possible efficiency of the generator?

A.  127

B.  827

C.  1927

D.  2627

[1]

Markscheme

D

Examiners report

Both HL and SL candidates found this question more challenging, with the large majority of candidates split between the three incorrect options. Option A was the most frequent (incorrect) answer, suggesting that candidates had correctly determined the proportion lost rather than that remaining to produce energy. Candidates should be reminded to consider whether or not their quantitative solutions are realistic; it is highly unlikely that a generator would have maximum efficiency of 1/27 (option A).

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