A train is passing by a platform at a constant speed of `40m//s`. The train horn is sounded at a frequency of `378 Hz`. Find the overall change in frequency as detected by a person standing on the platform, as the train moves from approaching to receding. (Take velocity of sound in air as `320m//s`).

A train is moving at a speed of 72 kmph towards a station sounding a whistle of frequency 640Hz. What is the apparent frequency of the whistle as heard by a man standing on the platform when train approaches towards him.

A train is approaching towards a platform with a speed of 10 m s^(-1) while blowing a whistle of frequency 340 Hz. What is the frequency of whistle heard by a stationary observer on the platform ? Given speed of sound = 340 ms^(-1) .

Two trains A and B are approaching a platform from opposite directions. The siren in the station is making a sound at a frequency 4 kHz. The passengers in trains A and B hear siren at frequencies 4.5 and 5 kHz respectively. Then the velocities of the trains A and B are (velocity of sound in air = 340 m//s)

A train is approaching towards a platform with a speed of 10 ms^(-1) , while blowing a whistle of frequency 340 Hz. What is the frequency of whistle heard by a stationary observer on the platform ? (given, speed of sound =340 ms^(-1) )

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 )

An engine of a train is moving towards a platform with a velocity of 100 m s^(-1) . If the frequency of sound produced is 200 Hz , find the apparent frequency of the sound as observed by an observer standing on the platform (Taking velocity of sound = 320 m s^(-1) ) .