A police siren emits a sound wave of frequency 440 Hz The

Last updated: 6/10/2023

A police siren emits a sound wave of frequency 440 Hz The speed of sound is 330 m s If police jeep moving with speed 20 m s is following a heavy truck moving with 10 m s then frequency of echo from truck heard by a policeman inside the jeep is nearly 1 440 Hz 3 450 Hz 4 480 Hz