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The diagram above illustrates a mode of vibration of a wire of length 125 cm. The...

Physics
WAEC 2023

The diagram above illustrates a mode of vibration of a wire of length 125 cm. The speed of the waves along the wire is 120 ms-1. Use the diagram to answer questions 2 and 3.
 

  • A. 1.00m
  • B. 0.75m
  • C. 0.25m
  • D. 0.50m
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Correct Answer: Option D
Explanation

Number of cycles, n = \(2\frac{1}{2} = \frac{5}{2}\)

Length = nλ

λ = \(\frac{Length}{n}\)  =  \(\frac{125}{\frac{5}{2}}\)

Therefore, λ = 50cm = 0.50m.


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