A string of length $L$ and mass $M$ hangs freely from a fixed point. Then the velocity of transverse waves along the string at a distance $x$ from the free end is
A$\sqrt {gL} $
B$\sqrt {gx} $
C$gL$
D$gx$
Diffcult
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B$\sqrt {gx} $
b (b) Velocity $v = \sqrt {\frac{T}{m}} $;
where $T = $ weight of part of rope hanging below the point under consideration
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