Find out the velocity at which a source of frequency 10,000 Hz should approach an observer at rest in order to produce a Doppler shift of 200Hz. (Velocity of sound=340m/s).

A source and an observer are approaching one another with the relative velocity 40m/s. If the true source frequency is 1200Hz, find the observed frequency under the following conditions : (I)All velocity is in the source alone (ii) All velocity is in the observer alone

An ultrasonic wave of frequency 45000Hz is sent out by sonar shows a frequency rise of 300Hz on reflection. From an approaching submarine. If velocity of sound in water is 1500m/s , calculate the speed of the submarine.

A car moving at a speed of 48km/hr passes by a siren which is surrounding at a frequency of 300Hz. Find out the apparent frequency of siren noted by the driver of the car as the car passes the siren (V=340m/s).