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Amplitude Variation

12. A source ...

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12. A source is moving down watds with a velocity of V/5 &observer 1 is helx fixed & another observer who is in liquid moving upwards with an velocity of V/5 the velocity of waves in the liquid is 4V then find the apparent frequency & wavelength according to observer 1 &another observer ? ( V is the velocity of sound waves )(neglect the gravitational acceleration )

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