system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do voices get squeakier when they are sped up?
gpt
Sound is a wave.  The frequency (as in high frequency, or high pitched) of a sound is literally how frequently a wave passes by a point.  So if you take a sound wave and compress it to half the time, you also double it's frequency (if you take something that has 100 waves in 1 second, and then squeeze it into half a second it's now playing at 100 waves per half second, or 200 waves a second).  So speeding up sounds make them higher frequency (squeakier) and slowing down sounds makes them lower frequency.