The reason a siren has a higher pitch as it approaches you is because: C. The crests of the sound wave are spaced closer together.
What is Sound Wave?
The pattern of disturbance as a result of the movement of energy that travels through a medium, such as air, liquid, or solid matter, is what we refer to as sound wave.
When object vibrate, sound waves are produced. Examples are sirens, vocal chords, etc.
Tus, the siren produces higher pith as it comes close to you because: C. The crests of the sound wave are spaced closer together.
Learn more about sound waves on:
https://brainly.com/question/1199084
#SPJ2
