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A sound source is moving towards a stat...

A sound source is moving towards a stationary observer with 1/10 of the speed of sound. The ratio of apparent to real frequency is

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`upsilon.=(vupsilon)/(v-v_(s))or(upsilon.)/(upsilon)=(v)/((v-(v)/(10)))=(10)/(9)`
`therefore (upsilon.)/(upsilon)=(10)/(9)`.
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