Question

A fire engine is rapidly approaching the corner. Explain what happens to the frequency of the sound wave as the fire engine draws closer. What do you hear?

Answer 1

it gets lower when it is slowing down

Answer 2

Increases

Step-by-step explanation:

The apparent change in the frequency of sound as there is a relative motion between the sorce and the observer is called doppler effect.

If the source of sound comes closer to the stationary observer, the frequency of sound increases.