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Q.

A source of sound produces waves of wavelength 60 cm when it is stationary. If the speed of sound in air is 320 m/s and source moves with speed 20 m/s, the wavelength of sound in the forward direction will be nearest to

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a

56 cm

b

60 cm

c

64 cm

d

68 cm

answer is A.

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Detailed Solution

λ'=v−vsvλ=320−2032060= 56.25cm
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