The Sound Waves Are Not Traveling That Fast

The sound waves are not travelling that fast. They're not traveling super sonically in the water. You can buy equipment to generate these for, you know, like a hundred bucks on line. It's nothing that fancyh and so the bubble expands and then collapses. And the collapses, actually, it collapses so hard that it generates light. Yes, you get this flash of light. There's not that much energy in this sound. But what comes out of the bubble are u v photons mean, some of them are visible, so you can see them with the naked eye. We don't really understand the physical process but we'll get into it later.