If source is at rest, observer is approaching source with velocity 1/5 th of velocity of sound. Find percentage change in frequency received by observer.

An observer is approaching a stationary source with a velocity 1/4 th of the velocity of sound. Then the ratio of the apparent frequency to actual frequency of source is

When both source and listener approach each other with a velocity equal to half the velocity of sound,the change in frequency of the sound as detected by listener is

A source of sound of frequency 1.8kHz moves uniformly along a straight line at a distance 250m from observer. The velocity of source is 0.8C where C is the velocity of sound. Find out the frequency of sound received by observer (in kHz) at the moment when the source gets closest to him.

A sound source emitting sound of frequency 450 Hz is approaching a stationary observer with velocity 30 ms^(-1) and another identical source is going away from the observer with the same velocity. If the velocity of sound is 330 ms^(-1) , then the difference of frequencies heard by observer is

When both source and observer approach each other with a speed a equal to the half the speed of sound, then determine the percentage change in frequency of sound as detected by the listener.

If an observer moves towards a stationary source of sound with a velocity of one tenth the velocity of sound, then the apparent increase in frequency will be

If a source of sound of frequency upsilon and a listener approach each other with a velocity equal to (1//20) of velocity of sound, the apparent frequency heard by the listener is