An engine standing at the platform blows a whistle of frequency 305 Hz. If the velocity of sound be 1220 km/h, the frequency of the whistle as heard by a man running towards the engine with a speed of 20 km/s is

A train stands at a platform blowing a whistle of frequency 400Hz in still air. What is the frequency of the whistle heard by a man running (a) towards the engine at 10ms^(-1) (b) away from the engine at 10m//s ? What is the wavelength of sound received by the running man in each case ?

A train stands at a platform, blowing a whistle of frequency 400 Hz in still aIr: What is the frequency of the whistle heard by a man running (a) towards the engine at 10 ms^(-1) (b) away from the engine at 10 ms^(-1)?

A person is standing on a railway platform. An engine blowing a whistle of frequency 640 Hz approaches him with a speed of 72 km//hr . The frequency of the note heard by the person is (velocity of sound is 340 m//s )

A person is standing on a railway platform.An engine blowing a whistle of frequency 640 Hz approaches him with a speed of 72 km /hr,The frequency of the note heard by the person is (velocity of sound is 340 m/s )

A train,standing at the outersignal of a railway station blows a whistle of frequency 400 Hz in still air. What is the frequency of the whistle for a platform observer when the train approaches the platform with a speed of 10 m s^-1

A train,standing at the outersignal of a railway station blows a whistle of frequency 400 Hz in still air. What is the frequency of the whistle for a platform observer when the train. recedes from the platform with a speed of 10 m s^-1 ?

A railway engine passes by the platform at a speed of 36 km/hr blowing its whistle having a frequency of 660 Hz. The different in the frequencies of the whistle heard by a person standing on the platform as the engine goes past the person is equal to

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.