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The diagram above shows the wire of a sonometer box set into resonance by a...

Physics
WAEC 2001

The diagram above shows the wire of a sonometer box set into resonance by a vibrating tuning fork of frequency f, when the wire is stretched by a tension T, the resonating length of the wire is I while the wavelength of the sound produced is \(\lambda\). Which of the following statements about the frequency of vibration of the wire is not correct?

  • A. proportional to the mass per unit length of the wire
  • B. equal to the frequency of the tuning fork
  • C. inversely proportional to the length of the wire
  • D. proportional to the sqare root of the tension
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Correct Answer: Option A
Explanation

The frequency of a vibrating stretched string or wire depends on three factors (i) Length of string l, (ii) Tension T, and (iii) Mass per unit length M

F ∝ \(\frac{1}{\text{l}}\)\(\sqrt{\frac{\text{T}}{\text{M}}}\)

From the formula above, the frequency of vibration of the wire is not proportional to the mass per unit length of the wire.

 


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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts