Post-UTME Physics 2008 Objective — Question 8

Question 8 of 10 from the Post-UTME Screening (Post-UTME) Physics 2008 Objective paper, with the correct answer and a full explanation.

The wavelength of the first overtone of a note in a closed pipe of length 33cm is

A. 44cm
B. 33cm
C. 22cm
D. 17cm

Explanation

For a closed pipe, the first overtone (3rd harmonic) has wavelength 4L/3 = 4(33)/3 = 44cm (option A); the source key marks 33cm (option B), which appears to be an error.

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