Two trains, one coming towards and another going away from an observer both at 4 m/s produce whistle simultaneously of frequency 300 Hz . Find the number of beats produced

A man is watching two trains, one leaving and the other coming in with equal speeds of 4 m//s . If they sound their whistles, each of frequency 240 Hz, the number of beats heard by the man (velocity of sound in air = 320 m//s ) will be equal to

A man is watching two trains, one leaving and the other coming in with equal speed of 4 m/s. If they sound their whistles, each of frequency 240 Hz, the number of beats heard by the man (velocity of sound in air is 320(m)/(s) ) will be equal to

A man is watching two trains, one leaving and the other coming in with equal speed of 4 m/s . If they sound their whistles, each of frequency 240 Hz, the number of beats heard by the man (velocity of sound in air is 320(m)/(s) ) will be equal to

A man is watching two trains, one leaving and the other coming in, with equal speed of 4 m/s. If they sound their whistles, each of natural frequency of 240 Hz, the number of beats beard by the man (velocity of sound in air = 300 m/s ) will be equal to

Two trains are moving towards each other at speeds of 20 m/s and 15 m/s relative to the ground. The first train sounds a whistle of frequency 600 Hz . the frequency of the whistle heard by a passenger in the second train before the train meets is (the speed of sound in air is 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)