A wire of $10^{-2} kgm^{-1}$ passes over a frictionless light pulley fixed on the top of a frictionless inclined plane which makes an angle of $30^o$ with the horizontal. Masses $m$ and $M$ are tied at two ends of wire such that m rests on the plane and $M$ hangs freely vertically downwards. The entire system is in equilibrium and a transverse wave propagates along the wire with a velocity of $100 ms^{^{-1}}$.

  • A

    $M = 5\,\, kg$

  • B

    $\frac{m}{M}$ $=\frac{1}{4}$

  • C

    $m = 20 \,\,kg$

  • D

    $\frac{m}{M}=4$

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