A boy riding on a bicycle going at `12 km h^-1` towards a vertical wall whistles at his dog on the ground. If the frequency of the whistle is 1600 Hz and the speed of sound in air is `330 m s^-1, find (a) the frequency of the whistle as received by the wall (b) the frequency of the reflected whistle as received by the boy.

A whistle whose air column is open at both ends has a fundamental frequency of 5100 Hz. If the speed of sound in air is 340 ms^(-1) , the length of the whistle, in cm, is

A man standing on a platform observes that the frequency of the sound of a whistle emitted by a train drops by 140 Hz. If the velocity of sound in air is 330 m/s and the speed of the train is 70 m/s, the frequency of the whistle is

A man standing on a platform observes that the frequency of the sound of a whistle emitted by a train drops by 140 Hz. If the velocity of sound in air is 330 m/s and the speed of the train is 70 m/s, the frequency of the whistle is

An automobile moving at 30 m/s is approaching a factory whistle that has a frequency of 500 Hz. If the speed of the sound in air is 340 m/s, then the apparent frequency of the whistle as heard by the driver is

A train whistling while approaching a railway platform with a speed of 90 km(s)^-1 .The frequency of sound of the whistle is 600 Hz.If the velocity of sound in air is 325 m(s)^-1 ,calculate the apparent frequency of the sound of the whistle as heard by an observer standing on the platform.

A toy train in a children amusement park runs on an elliptical orbit having major and minor axis in the ratio of 4 : 3 . The length of the train is exactly equal to half the perimeter of the elliptical track. The train is travelling at a constant speed of 20 ms^( –1) . The engine sounds a whistle when its acceleration is minimum. The whistle has a frequency of f_(0) = 3460 Hz and speed of sound in air is V = 330 ms^( –1) (a) What frequency of whistle is received by a passenger in the last compartment of the train? (b) What frequency of whistle is received by a passenger sitting in the central compartment of the train?