A train, standing at the outer signal of a railway station blows a whistle of frequency 800 Hz 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 20 m/s (b) recedes from the platform with a speed of 20 m/s? (ii) What is the speed of sound in each case ? The speed of sound in still air can be taken as 340 m/s.

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A train, standing at the outer signal of a railway station blows a whistle of frequency 800 Hz 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 20 m/s (b) recedes from the platform with a speed of 20 m/s? (ii) What is the speed of sound in each case ? The speed of sound in still air can be taken as 340 m/s.

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