A speaker emits a sound wave of frequency `f_(0)`. When it moves towards a stationary observer with
Channel: Doubtnut
Date: 2020-08-30

A speaker emits a sound wave of frequency `f_(0)`. When it moves towards a stationary observer with speed u, the observer measures a frequency `f_(1)`. If the speaker is stationary, and the observer moves towards it with speed u, the measured frequency is `f_(2)`. Then -