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According to the relations shown in the figure, the speed of a transverse wave on a stretched string is 
A$v=\sqrt{\dfrac{T}{\mu}}$
B$v=\sqrt{\dfrac{\mu}{T}}$
C$v=\sqrt{\dfrac{Y}{\rho}}$
D$v=\sqrt{\dfrac{B}{\rho}}$
Answer & Solution
Correct answer: A. $v=\sqrt{\dfrac{T}{\mu}}$
For a transverse wave on a string, the restoring factor is tension $T$ and the inertial factor is linear mass density $\mu$. Therefore the speed is $v=\sqrt{T/\mu}$. The other two expressions correspond to waves in solids and fluids, not a stretched string.
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