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

the doppler effect. as it gets closer the frequency increases and gets louder 

Answer 2

I will hear a higher frequency than what was actually being transmitted.

Step-by-step explanation:

The Doppler effect is the change of wavelength of frequency when the source of sound is moving relative to the listeners position. There will be a change in pitch when the fire engine will pass me.

The received frequency will be higher than the emitted frequency. This happens because the crest of the wave will be emitted from a location closer to the observer.