I observed something which I've never seen before. We left the tap open and the water stream was flowing in a particular pattern. When we placed a beaker under the water stream, the pattern disappeared. And the pattern itself was oscillating.
Here's the video link.
Below the the photos of the effect.
I saw something like this here. But I'm not certain if it's the same. Is the pattern a standing wave? If yes, is it sound? And why does the pattern disappear when we place a beaker under it? In the later part of the video, you can see that the pattern itself is oscillating. Why is that happening?
