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A passenger is sitting in a fast moving...

A passenger is sitting in a fast moving train The engine of the train below a whistle of frequency 'n' .If the apparent frequency of sound heard by the passenger is 'n' then

A

` n 'ltn`

B

` ntgtn`

C

` n' =n`

D

` n'gen `

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TARGET PUBLICATION-WAVE MOTION -MCQ 7.1
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