JAMB Physics 2007 Objective — Question 2

Question 2 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2007 Objective paper, with the correct answer and a full explanation.

The fundamental frequency of a plucked wire under tension of 400N is 250Hz. When the frequency is changed to 500Hz at constant length, the tension is

A. 40N
B. 160N
C. 400N
D. 1600NCorrect

Explanation

f is proportional to sqrt(T). f1/f2 = sqrt(T1/T2): 250/500 = sqrt(400/T2), giving T2 = 1600N.

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