Question

(b) An ambulance with its siren sounding is standing in heavy traffic. A pedestrian
notices that although the loudness of the sound produced does not change but
the pitch varies. What could be the possible reason for that. 1
The me​

Answer 1

Answer:

the main reason for that is frequency...due to frequency the sound waves varies from one way to other

Answer 2

Answer:

An ambulance with its siren sounding is standing in heavy traffic.