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The wave length of the sound produced by a source is 0.8m. If the source moves towards the stationary listener at 32 ms^–1, what is the apparent wave length of sound if the velocity of sound is 320 ms^–1

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0.32 m

0.4 m

0.72 m

0.80 m

answer is C.

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Detailed Solution

$λ_{1} = (\frac{V - V_{s}}{V}) λ = [\frac{320 - 32}{320}] 0.8 = \frac{288}{320} x 8 x 10^{- 1} = 0.72 m$

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