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)?

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 standing at the outer signal of a railway station, blows a whistle of frequency 400 Hz in stil air. (i) What is the frequency of the whistle for a platform observer when the train (a) approaches the platform with a speed of 10 ms^(-1) . (b) recedes from the platform with a speed of 10 ms ? What is the speed of sound in each case? (V=340ms^(-1)) .

A train, standing at the outer signal of a railway station blows a whistle of frequency 400Hz in still air. (i) What is the frequency of the whistle for a platform observer when the train (a) approaches the platform with a speed of 10ms^(-1) , (b) receeds from the platform with a speed of 10ms^(-1) ? (ii) What is the speed of sound in each case ? The speed of sound in still air can be taken as 340ms^(-1)

A train, standing at the outer signal of a railway station blows a whistle of frequency 400Hz in still air. (i) What is the frequency of the whistle for a platform observer when the train (a) approaches the platform with a speed of 10ms^(-1) , (b) receds fromk the platform with a speed of 10ms^(-1) ? (ii) What is the speed of sound in each case ? The speed of sound in still air can be taken as 340ms^(-1)

A train standing at the outer signal of a railway station blows a whistle of frequency 400Hz in still air. (i) What is the frequency of the whistle for a platform observer when the train (a) approaches the platform with a speed of 10 ms^(-1) . (b) recedes from the platform with a speed of 10ms^(-1) ? (ii) What is the speed of sound in each case? The speed of sound in still air can be taken as 340ms^(-1) .