An observer moves towards a stationary source of sound of frequency n . The apparent frequency heard by him is 2 n . If the velocity of sound in air is 332 m/sec, then the velocity of the observer is

An observer moves towards a stationary source of sound. The percentage change in the apparent frequency is

An observer moving towards a stationary source observes that the apparent frequency is three times the actual frequency of the source. If the velocity of sound is V, the velocity of the observer would be-

An observer moves towards a stationary source of sound with a velocity of one-tenth th velocity of sound.The apparent increase in frequency is :

A source is moving towards a stationary observer, so that the apparent frequency increases by 50%. If velocity of sound is 330 m/s, then velocity of source is

If an observer is moving with uniform velocity v to wards a stationary source of frequency n, and if the velocity of sound in the medium is V, then the apparent change in the frequency of the sound, heard by the observer, is -

An observer moves towards a stationary source of sound with a velocity one-fifth of velocity of sound. The percentage increase in apparent frequency is