A man standing near a railway line hears the whistle of an engine, which has a velocity of `20 ms^-1`.What frequency does the man hear, when the engine is coming towards and going away from him, if the true frequency of the whistle is 1000 Hz ? Speed of sound in air = `340 ms^-1`

A man sitting in a moving train hears the whistle of the engine. The frequency of the whistle is 600 Hz

What is the minimum distance required to hear an echo, when the speed of sound in air is 340 ms^(-1) ?

A man is standing on a railway platform listening to the whistle of an engine, that passes the man at constant speed without stopping. If the engine passes the man at time t_(0) , how does the frequency f of the whistle as head by the man changes with time ?

A man is standing on a railway platform listening to the whistle of an engine that passes the man at constant speed without stopping. If the engine passes the man at time t_0 How does the frequency f of the whistle as heard by the man changes with time.

Find the greatest length of an organ pipe open at both ends that will have its fundamental frequency in the normal hearing range (20-20,000 Hz). Speed of sound in air = 340 ms^-1 .

An observer on a railway platform noticed that when a train passed through the station, at a speed of 72 kg h^(-1) , the frequency of the whistle appeared to drop by 500 Hz. Calculate the actual frequency of the note produced by the whistle. Velocity of sound in air = 340 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 is travelling at 120kmph and blows a whistle of frequency 1000Hz . The frequency of the note heard by a stationary observer if the train is approaching him and moving away from him are (Velocity of sound in air =330=ms^(-1) )