21 ms·
The other answers are correct that it's an acoustic wave, but sometimes it helps to see a demo "proving" it: https://youtu.be/DqhXsEgLMJ0 https://youtu.be/DqhX
by AlotOfReading 3y ago
The other answers are correct that it's an acoustic wave, but sometimes it helps to see a demo "proving" it:
https://youtu.be/DqhXsEgLMJ0 https://youtu.be/DqhXsEgLMJ0