Two aeroplanes 'A' and 'B' are moving away from one another with a speed of 720 kmph. The frequency of the whistle emitted by 'A' is 1100 Hz. Calculate the apparent frequency of the whistle as heard by the passenger of the aeroplane 'B'. Velocity of sound in air is `350 m//s^(-1)`

A railway engine moving with a speed of 60 m/s passes in front of a stationary listener. The real frequency of the whistle is 400 Hz. Calculate the apparent frequency heard by the listener (a) When the engine is approaching the listener (b) When the engine is moving away from listener (V=340 m/s)

Two trains are moving towards each other at speeds of 144 km/hr and 54 km/hr relative to the ground. The first train sounds a whistle of frequency 600 Hz. Find the frequency of the whistle as heard by a passenger in the second train before the trains meet. (y =340m/s)

The source and an observer move away from each other, each with a velocity of 10m//s , with respect to ground, If the obsever find the frequency of sound coming from the source as 1950Hz, the original frequency of the source is (assume velocity of sound in air = 340ms^-1 )

An observer is standing 500 m away from a vertical hill. Starting between the observer and the hill, a police van sounding a siren of frequency 1000 Hz moves towards the hill with a uniform speed. If the frequency of the sound heard directly from the siren is 970 Hz, the frequency of the sound heard after reflection from the hill (in Hz) is about,(velocity of sound = 330ms^-1