A violin player riding on a slow train plays a 440 Hz note. Another violin player standing near the track plays the same note. When the two are close by and the train approaches the person on the ground, he hears 4'0 beats per second. The speed of sound in air` = 340 ms^-1` (a) Calculate the speed of the train. (b) What beat frequency is heard by the player in the train ?

If vibrating tuning fork of frequency 255Hz is moving with a velocity 4ms^-1 towards the wall the number of beats heard per second is (speed of sound in air = 340ms^-1 ).

A train is running at a constant speed of 90 km/h on a straight track. A person standing at the top of a boggey moves in the direction of motion of the train such that he covers 1 meters on the train each second. The speed of the person with respect to ground to -

A train is running at a constant speed of 90 km/h on a straight track. A person standing at the top of a boggey moves in the direction of motion of the train such that he covers 1 meters on the train each second. The speed of the person with respect to ground to -

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

A source of sound is moving towards a high wall with a speed of 20 m/s. The frequency of the sound produced by the source is 400 Hz. If the speed of the sound is 340 m/s, then the beat frequency heard by a person standing near the wall will be

Two electric trains run at the same speed of 72 km h^-1 along the same track and in the same direction with a separation of 2.4 kin between them. The two trains simultaneously sound brief whistles. A person is situated at a perpendicular distance of 500 m from the track and is equidistant from the two trains at the instant of the whistling. If both the whistles were at 500 Hz and the speed of sound in air is 340 m s^-1 , find the frequencies heard by the person.

Two electric trains run at the same speed of 72 km h^-1 along the same track and in the same direction with a separation of 2.4 km between them. The two trains simultaneously sound brief whistles. A person is situated at a perpendicular distance of 500 m from the track and is equidistant from the two trains at the instant of the whistling. If both the whistles were at 500 Hz and the speed of sound in air is 340 m s^-1 , find the frequencies heard by the person.