Joint Entrance Examination/AIEEE 2009/Q080 DOPPLER EFFECT

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Original Question by 164.100.170.4 Here's the question... Q80. A motor cycle starts from rest and accelerates along a straight path at 2 m/s2. At the starting point of the motor cycle there is a stationary electric siren. How far has the motor cycle gone when the driver hears the frequency of the siren at 94% of its value when the motor cycle was at rest ? (Speed of sound = 330 ms–1) (1) 98 m (2) 147 m (3) 196 m (4) 49 m Posted by 164.100.170.4 12:08, 24 September 2009 (UTC) Post a reply![1]

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Reply to the thread, posted by 164.100.170.4 Thread post Additional notes f′ =f[v –v0]/v speed of sound=v speed of observer=v0 ⇒ 0.94 = 1– v0/v ⇒ v0 = 19.8 m/s ⇒ Distance covered = [v0]2/2a= 98 m These comments, along with the notes on the left, were contributed by 164.100.170.4 12:17, 24 September 2009 (UTC)

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