AP EAMCET · PHYSICS · Waves and Sound
A string of length \(1 \mathrm{~m}\) and mass \(490 \mathrm{~g}\) is put under a tension of \(25 \mathrm{~N}\). A wave of frequency \(120 \mathrm{~Hz}\) is sent along it. The speed of this wave is
- A \(7.14 \mathrm{~ms}^{-1}\)
- B \(0.71 \mathrm{~ms}^{-1}\)
- C \(0.51 \mathrm{~ms}^{-1}\)
- D \(51.0 \mathrm{~ms}^{-1}\)
Answer & Solution
Correct Answer
(A) \(7.14 \mathrm{~ms}^{-1}\)
Step-by-step Solution
Detailed explanation
The wave speed is given as \[ \mathrm{V}=\sqrt{\frac{\mathrm{T}}{\mu}}=\sqrt{\frac{25}{0.49} \times 1}=7.14 \mathrm{~m} / \mathrm{s} \]
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