2 ms·
I conflate the two because I was temporarily nuts. Doh! Of course ultrasound exists, and can exist in air up to the GHz range (not for very far). Anyway, sorr
by creeble 7y ago
I conflate the two because I was temporarily nuts. Doh!
Of course ultrasound exists, and can exist in air up to the GHz range (not for very far).
Anyway, sorry for misinfo and thanks for the correction.
- tomxor 7y agoNo worries. It's probably not helped by the fact that RF starts at around 20 KHz in EM at the same frequency where human hearing range ends in sound waves. So it's fairly easy to read a bunch of statements about frequency ranges and then mix up mediums, especially when EM contains a bunch of seemingly very different things, light, RF, xrays etc.