A police car horn emits a sound at a frequency 240 Hz. When the car is at rest. If the speed of the
Channel: Doubtnut
Date: 2020-01-26

A police car horn emits a sound at a frequency 240 Hz. When the car is at rest. If the speed of the sound is 330 m/s the frequency heard by an observer who is approching the car at a speed of 11 m/s is