The pitch of the whistle of an engine ap...

The pitch of the whistle of an engine appears to drop to `(frac(5)(6)^(th)` of original value when it passes a stationary observer. If the speed of sound in air in `350 m//s` then the speed of engine is

`35 m//s`

`70 m//s`

`105 m//s`

`140 m//s`

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TARGET PUBLICATION-Sound-Exercise

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