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A sound wave travels with a velocity of $ 300\: ms^{-1}$ through a gas. 9 beats are produced in 3 sec when two waves pass through it simultaneously. If one of the waves has 2 m wavelength, the wavelength of the other wave is :

$\begin {array} {1 1} (1)\;1.98 \: m & \quad (2)\;2.04\: m \\ (3)\;2.00\: m & \quad (4)\;1.99\: m \end {array}$

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Ans : (2)
2.04 m
answered Feb 27, 2014 by thanvigandhi_1

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