A person riding on a merry go round emits a sound wave of a certain frequency Does a person at the centre observe the Doppler effect?

Which frequency produces a sound that can be heard by a person?

A person hears lounder sound at a point in a stationary wave at

Towards a stationary object, a train is moving with a speed of 300 m/s and emits a sound wave of frequency 2000 Hz. Small percentage of the sound is reflected back to train in the form of echo. The frequency of the echo as detected by a person sitting in the train will be (speed of sound is 340 m/s).

Why does a child in a merry - go - round press the side of his seat radially outward ?

A person is standing at distance of r from a source of sound. The frequency and intensity of sound observed by him are f and I respectively. Now he moves with a uniform velocity away from sound source, then he will observers that -

Is there a Doppler effect in the case of sound when the observer or the source moves at right angles to the line joining them? How then can we determine the Doppler effect when the motion has a component at right angles to this line?

A sound source, emitting sound of constant frequency, moves with a constant speed and crosses a stationary observer. The frequency (n) of sound heard by the observer is plotted against time (t). Which of the following graphs represents the correct variation :-

A speaker emits a sound wave of frequency f_(0) . When it moves towards a stationary observer with speed u, the observer measures a frequency f_(1) . If the speaker is stationary, and the observer moves towards it with speed u, the measured frequency is f_(2) . Then -

A person riding a car moving at 72 km h^-1 sounds a whistle emitting a wave of frequency 1250 Hz. What frequency will be heard by another person standing on the road (a) in front of the car (b) behind the car ? Speed of sound in air = 340 m s^-1 .