. A boat is travelling in a river with a speed 10 m/sec along the stream flowing with a speed 2m/sec. From this boat, a sound transmitters is lowered in

A boat is travelling in a river with a speed 10 m/sec along the stream flowing with a speed 2m/sec. From this boat, a sound transmitters is lowered into the river through a rigid support. The wavelength of the sound emitted from the transmitter inside the water is 14.45 mm. Assume that attenuation of sound in water and air is negligible. Frequency detected by receiver kept inside the river down stream will be

(A):1.007 ´ 10⁵Hz
(B):2.005 ´ 10⁵Hz
(C):2.007 ´ 10⁵Hz
(D):1.007 ´ 10⁵Hz (K = 2.088 ´ ⁹pa r = 10³ks/m³)

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(B): 2

. A boat is travelling in a river with a speed 10 m/sec along the stream flowing with a speed 2m/sec. From this boat, a sound transmitters is lowered in

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