A train is moving with speed 72 km/h towards a hill blows a whistle of frequency 1240Hz. the frequency of echo heard by driver is(speed of sound=330m/s)

a bus is moving towards and stationary observer with speed 20 m/s blows a horn of frequency 200 Hz. the frequency of sound heard by the observer is approximately ( take speed of sound 320 m/s)

a bus is moving in a circle around a listener with speed 20 m/s of radius 2 m. Bus driver blows a horn with frequency 210 Hz. the frequency of sound heard by the listener is

Two cars are moving on two perpendicular roads towards a crossing with uniform speeds of 72 kmph and 36 kmph. If first car blows horn of frequency 300 Hz, then the frequency of horn heard by the driver of second car when line joining the cars make 45° angle with the roads will be (Speed of sound = 330 m/s)

Two engines pass each other moving in opposite directions with uniform speed of 30m/so .one of them is blowing a whistle of frequency 540 Hz. Calculate the frequency heard by driver of second engine before they pass each other. Speed of sound is 300 m/sec :

One train is approaching an observer at rest and another train is receding him with same velocity 4 ms^(-1) . Both the trains blow whistles of same frequency of 243 Hz. The beat frequency in Hz as heard by the observer is (speed of sound in air= 320ms^(-1) )

The engine of a train sound a whistle at frequency v, the frequency heard by a passenger is

A person is observing two trains, one is approaching him with a velocity of of 4 m/s while the other is receding from him with the same velocity. IF both the trains blow their respective whistles of frequency 240 hertz, the beat frequency heard by the observer will be (speed of sound in air = 320 m/s)

A car is moving towards a fixed wall, it blows form of frequency of 440 Hz . The frequency of reflected sound observed by the driver is 480 Hz then find the speed of car in km/hr. (Speed of sound is 350 m/sec

A car is moving with 90 km h^(-1) blows a horn of 150 Hz, towards a cliff. The frequency of the reflected sound heard by the driver will be (speed of sound in air is 340 ms^(-1) )

One train is approaching an observer at rest and another train is receding from him with the same velocity 4 m//s . Both trains blow whistles of same frequency of 243 H_(Z) . The beat frequency in H_(Z) as heard by observer is (speed of sound in air = 320 m//s )