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Q.

The wavelength is 120 cm when the source is stationary. If the source is moving with relative velocity of 60 m/sec towards the observer, then the wavelength of the sound wave reaching to the observer will be (velocity of sound = 330 m/s)

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a

98 cm

b

140 cm

c

120 cm

d

144 cm

answer is A.

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Detailed Solution

n'=n vv−vs⇒λ'=λv−vSv⇒λ'=120 330−60330=98 cm.

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The wavelength is 120 cm when the source is stationary. If the source is moving with relative velocity of 60 m/sec towards the observer, then the wavelength of the sound wave reaching to the observer will be (velocity of sound = 330 m/s)