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A rocket is moving at a speed of 220 ms^...

A rocket is moving at a speed of 220 `ms^(-1)` towards a stationary target. While moving, it emits a wave of frequency 500 Hz. What is the frequency of the sound as detected by the target?

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The correct Answer is:
1500 Hz
`v=v_0((v)/(v-v_s))`
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