A stationary source producing a sound of frequency 90 Hz. What will be the frequency heard by the listener at a distance of 50 m in rest?
The correct option is A 90 Given that the source and the listener are at rest with respect to each other. In this case, there will be no Doppler effect. So, the frequency of the sound heard by the listener is equal to the frequency of sound emitted by the source =90Hz.