The pitch of the whistle of an engine th appears to drop to 6. 5 of original value when passes a stationary observer. If the speed of sound in air is 350 m/s then the speed of it engine is (a) 35 m/s (b) 70 m/s (c) 105 m/s (d) 140 m/s

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The pitch of the whistle of an engine
th
appears to drop to
of original value when
it passes a stationary observer. If the speed of
sound in air is 350 m/s then the speed of
engine is
(a)
35 m/s
(b) 70 m/s
(c)
105 m/s
(d) 140 m/s
Transcribed Image Text:The pitch of the whistle of an engine th appears to drop to of original value when it passes a stationary observer. If the speed of sound in air is 350 m/s then the speed of engine is (a) 35 m/s (b) 70 m/s (c) 105 m/s (d) 140 m/s
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