2 ms·

Countercounterexample: https://www.livescience.com/64619-laser-sound-beam.html https://www.livescience.com/64619-laser-sound-beam.html

• mrob 6y ago
  That's a laser specifically designed for transmitting sound, not a laser microphone.
  • c22 6y ago
    You know, I had that (extremely pedantic) thought as I was posting, but I figured someone might find it interesting anyway.