Two trains "(A&B)" are moving toward each other on two parallel tracks at the same speed u with respect to the ground. The whistle of train A blows. In which of the following cases, the frequency of the sound heard by a passenger on the other train B will be greatest?

Two trains are moving towards each other and cross each other. The apparent pitch

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 on parallel tracks at speeds of 144kmph and 54kmph . The first train sounds a whistle of frequency 600Hz . Frequency of the whistle as heard by a passenger in the second train is ( V=340m//s )

Two trains are moving towards each other at speeds of 72kmh^-1 and 54 kmh^-1 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 a. before the trains meet and b. after teh trains have crossed each other. The speed of sound in air is 340 ms^-1

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

A passenger is sitting in a fast moving train The engine of the train below a whistle of frequency 'n' .If the apparent frequency of sound heard by the passenger is 'n' then

Two trains A and B are approaching each other with 108 km h^(-1) and 126 km h^(-1) , respectively . If the train A sounds a whistle of frequency 500 Hz , find the frequency of the whistle as heard by a passenger in the train B . (a) before the trains cross each other and (b) after the trains cross each other . (Take velocity of sound as 330 m s^(-1) )

two trains move towards each other sith the same speed. The speed of sound is 340 m/s. If the height of the tone of the whistle of one of them heard on the other changes

Two trains move towards each other with the same speed. Speed of sound is 340ms^(-1) . Frequency of tone of the whistle of one when heard by the other changes 9/8 times, then the speed of each trains is