A trian standing at the outer signal of a railway station belows a whistle of frequency 400 Hz `
Channel: Doubtnut
Date: 2020-01-19

A trian standing at the outer signal of a railway station belows a whistle of frequency 400 Hz still air. The train begins to move with a speed of `10ms^(-1)` towards the platform. What is the frequecncy of the sound for and obeserver standing on the platform? (sound velocity in air `330 ms^(-1))`