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train , standing at the outer signal of ...

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

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The correct Answer is:
[ (i) (a) 412 Hz (b) 389 Hz , (ii) 340 m ` s^(-1) ` in each case ]
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