Re:What are terahertz waves useful for?
by jameshart on Saturday April 02, 2022 @06:27PM
(#30892222)
The diagram of the EM spectrum at the top has a very confusing section on the left where ranges of frequencies are labeled 'infrasound', 'perceptible sound' and 'ultrasound'. They have nothing to do with the ability of the corresponding radio waves to be modulated to transmit sound signals, but are literally just marking off the frequencies that correspond to those ranges in sound waves, over a diagram of EM frequencies.
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Re:What are terahertz waves useful for?
by danielmittleman on Saturday April 02, 2022 @06:29PM
(#30892240)
Yea, that's confusing, despite not being wrong. It is a juxtaposition of two completely distinct phenomena on one graphic, which is confusing, for sure. But the whole article is about EM waves, not sound waves.
Sigh.
I didn't discuss the article. I believe I scoped my comment to the "infographic" in the first line, and closed with "But I doubt this is what the graphic is suggesting either."
I also shared the same information as your 2nd (aside: sound doesn't require air, as bone conduction headphones or scuba diving demonstrate, does require "not vacuum") and 3rd paragraph, and made the same point as in your close.
So I agree with you, which is why I objected to the graphic.