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JAMB Physics 2021 Objective — Question 22

Question 22 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2021 Objective paper, with the correct answer and a full explanation.

First three harmonics of stretched string (length 2m, v=150 m/s):

A. 37.5, 75, 150 Hz
B. 37.5, 75, 112.5 HzCorrect
C. 187.5, 56.25, 93.75 Hz
D. 18.75, 37.5, 56.25 Hz

Explanation

f₁=v/2L=37.5 Hz; f₂=75 Hz; f₃=112.5 Hz.

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