Question

Before 20 seconds to reach the station a train blow horn. A man standing on platform hear the sound of horn 17 seconds before train reach the station. If speed of sound is 300 m/sec then find the speed of the train.​

Answer 1

Step-by-step explanation:

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 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

−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