When I’m filling a big jug of water, why does the pitch of the stream hitting the water inside get higher as it gets closer to the top?

Question

When I’m filling a big jug of water, why does the pitch of the stream hitting the water inside get higher as it gets closer to the top?

In: 16

Answer 1

Because there’s less air/free glass to vibrate, so the soundwaves produced have to fit in a smaller space. As those soundwaves get closer together, the pitch rises.

Pitch = cycles per second. The more cycles per second, the higher the pitch.