Question

how does pitch relate to sound?

Answer 1

Pitch is the shrillness of sound. It depends on the frequency of the sound. A girl's voice is generally higher in pitch than a boy's. A mosquito humming close to your ears sounds very irritating, because that sound is of a very high pitch(and so, very high frequency).
The best way to understand pitch is to hear it. http://www.youtube.com/watch?v=4G60hM1W_mk
Go there, and hear sounds of different frequencies(different pitch)

Answer 2

Also, horror movies like Paranormal activity use sounds of extremely low frequencies to make things more horrifying!

Answer 3

If you need more explanation, pls tell me

Answer 4

what else

Answer 5

Frequency is directly proportional to pitch of sound.