How we hear the Changes of frequency of sound?

We can hear the changes of frequency of sound by Pitch of the sound.

Explanation:

Sound waves have different parameters like Pitch, Loudness, Intensity etc. Any kind of waves consists of parameters like wavelength and frequency. So pitch is directly related to frequency. If the change in frequency is more, the pitch will be termed as high and if the change in frequency is low, the pitch will be low. So the terminology pitch is used for hearing the sound waves. While frequency is the parameter of the propagation or travelling of sound wave, pitch is the nature of change in frequency heard by the observer.

answer: i'm not sure which is which for i get confused on it all the time but i can tell you that the answer lies with the convex and concave devices. i hope this you. have a good day and best of luck to you!

explanation:

a

explanation:

no diagram was provided, but i'm guessing it's the one i've attached to my answer.

here, a mechanical force turns the rod.   this generates an electric current in the coil, which powers the bulb.