4 ms·

What? E=h×freq, where h is plancks constant. So higher frequency, higher the energy. How did you come to the opposite conclusion?

vel0city 2y ago
Penetration power of a material, not energy. An arrow is going to have more penetrating power than a baseball bat despite the bat potentially imparting more total energy. Lower frequency waves tend to go through things more while higher frequencies tend to get attenuated and absorbed by materials. So, if you're worried about the waves going deep through your tissues and into your brain, its less likely those waves will end up reaching very deep and will tend to be absorbed on the surface of your skin.
- cogman10 2y ago
  Not for nothing, but generally speaking the lower frequency transmissions haven't fallen out of use. Instead, they are deployed more in less populated areas. (Not saying these signals cause cancer, just that they are still in use).
  - vel0city 2y ago
    Oh, I totally agree and understand that point. I was just trying to clarify the power misunderstanding. But yes, 700ishMHz and up is still plenty used in modern 4/5G deployments.
    - cogman10 2y ago
      Also agree. I mean, for context, basically all EMF that we are talking about for communications are sub-visible spectrum by a long shot. Visible light operates in the Terahertz range (400->790THz) while all communications are 1000x (or 100,000x) lower frequencies, with the highest being around 20GHz. Ionizing radiation happens at even higher frequencies than the visible spectrum. That's why I see it as silly to worry about the higher energy of higher frequencies. We are talking about much lower frequencies and exposure vs what you get hit with everyday by turning on a lamp or walking in the sun.
janice1999 2y ago
The other response to you is correct. It's about material blocking. Skin depth, how far electromagnetic waves can penetrate, is inversely proportional to the square root of the frequency.

vel0city 2y ago

Penetration power of a material, not energy. An arrow is going to have more penetrating power than a baseball bat despite the bat potentially imparting more total energy. Lower frequency waves tend to go through things more while higher frequencies tend to get attenuated and absorbed by materials. So, if you're worried about the waves going deep through your tissues and into your brain, its less likely those waves will end up reaching very deep and will tend to be absorbed on the surface of your skin.

cogman10 2y ago
Not for nothing, but generally speaking the lower frequency transmissions haven't fallen out of use. Instead, they are deployed more in less populated areas. (Not saying these signals cause cancer, just that they are still in use).
- vel0city 2y ago
  Oh, I totally agree and understand that point. I was just trying to clarify the power misunderstanding. But yes, 700ishMHz and up is still plenty used in modern 4/5G deployments.
  - cogman10 2y ago
    Also agree. I mean, for context, basically all EMF that we are talking about for communications are sub-visible spectrum by a long shot. Visible light operates in the Terahertz range (400->790THz) while all communications are 1000x (or 100,000x) lower frequencies, with the highest being around 20GHz. Ionizing radiation happens at even higher frequencies than the visible spectrum. That's why I see it as silly to worry about the higher energy of higher frequencies. We are talking about much lower frequencies and exposure vs what you get hit with everyday by turning on a lamp or walking in the sun.

janice1999 2y ago

The other response to you is correct. It's about material blocking. Skin depth, how far electromagnetic waves can penetrate, is inversely proportional to the square root of the frequency.