Two sound waves move in the same direction in the same medium. The pressure amplitude of the waves are equal but the wavelength of the first wave is double that of the second. Let the average power transmitted across a cross section by the two wave be P 1 and P 2 and their displacement amplitudes be s 1 and s 2 then
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(a, d)
P o = B k S 0 , B 1 k 1 S 1 = B 2 k 2 S 2
here B 1 = B 2 of same medium
= 2
Power = 
P 0 is same for both waves
ρ is same for both waves
v is same for both waves
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