You have to amplify the sound.

Every sound vibrates with a particular fundamental frequency. When you change the wavelength of a sound, you change the pitch of a sound.

No, the word "change" does not have a long vowel sound. The 'a' in "change" makes a short vowel sound, like in the word "cat."

Whenever the frequency of a sound wave changes, regardless of what caused it

to change, the change is perceived as a change in the pitch of the sound.

Change Is a Sound was created on 2001-08-14.