Post-UTME Physics 2015 Objective — Question 7

Question 7 of 20 from the Post-UTME Screening (Post-UTME) Physics 2015 Objective paper, with the correct answer and a full explanation.

Which of the following correctly gives the second harmonic of a closed pipe? (Note: a closed pipe supports only odd-numbered harmonics of its fundamental frequency f - i.e. f, 3f, 5f, ... A true 'second harmonic', 2f, does not occur in a closed pipe.)

Explanation

The options for this question were cut off in the source scan, so no lettered answer can be given. However, the key physics concept is: a closed (one end closed) pipe only resonates at odd harmonics of its fundamental (f, 3f, 5f, ...); it has no true even harmonic such as 2f. Please match this principle to the actual options on your paper.

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