What is the name of the perceived change in a sound wave s

Last updated: 4/26/2023

What is the name of the perceived change in a sound wave s frequency due to motion between the observer and the sound source O diffraction O Doppler effect O reflection O resonance An ambulance emits a frequency of 450 Hz from its siren What frequency is heard by a man as the ambulance moves toward him O less than 450 Hz O more than 450 Hz O 450 Hz 0 Hz