Question

A boat is travelling in a river with a speed 2m//s. From this boat, a sound transmitter is lowered into the river through a rigid support. The wavelength of the sound emitted from the transmitter inside the water is 14.45mm. Assume that attenuation of sound in water and air is negligible. (a) What will be the frequency detected by a receiver kept inside the river downstream? (b) The transmitter and the receiver are now pulled up into air. the air is blowing with a speed 5m//s in the direction opposite the river stream. Determine the frequency of the sound detected by the receiver. (Temperature of the air and water = 20^(@)C, Density of river water = 10^(3) kg//m^(3), Bulk modulus of the water = 2.088 xx 10^(9)Pa, gas constant R = 8.31 J//mol-K, Mean molecular mass of air = 28.8 xx 10^(-3) kg//mol, C_(P)//C_(V) for air = 1.4)

Answer 1

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