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A source of sound producing wavelength 50 cm is moving away from a stationary observer with $ \large\frac{1}{5}th$ speed of sound. Then what is the wavelength of sound heard by the observer?

$\begin {array} {1 1} (1)\;55\: cm & \quad (2)\;40\: cm \\ (3)\;60\: cm & \quad (4)\;70\: cm \end {array}$

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(3) 60 cm
answered Nov 7, 2013 by pady_1

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