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Question

Two sound waves move in the same diretion in the same medium. The pressure amplitudes of the waves are equal but the wavelength of the first wave is double the second. Let the average power transmitted across a cross saection by the first wave be P1 and that by the second wave be P2 . Then

A
P1=P2
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B
P1=4P2
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C
P2=2P1
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D
P2=4P1
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