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[" 117.A source of sound with frequency ...

[" 117.A source of sound with frequency "256Hz" is moving with a "],[" velocity "v" towards a wall.When the observer is between "],[" source and the wall,he finds that the frequency of two "],[" waves received directly from the source is "x" and the "],[" frequency of the waves received after reflection from the "],[" wall is "y" ,then "],[[" (a) "x>y," (b) "x

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