Wikipedia:Reference desk/Archives/Science/2021 July 10

= July 10 =

Why UV rays is good for health if it is higher frequency than 5G?

 * Ultraviolet rays from the Sun are high-frequency and can be dangerous.

Source

Why UV rays is good for health with such higher frequency? Good means here Rizosome (talk) 15:25, 10 July 2021 (UTC)
 * You just quoted something saying it wasn't good for your health. You seem to have answered your own question by showing your question is false. While it is an oversimplification to say that UV is dangerous, you haven't presented anything suggesting it is good for your health. --OuroborosCobra (talk) 15:36, 10 July 2021 (UTC)
 * You can also kill yourself by drinking too much water. Is water "bad" for you? You can die from exposure to high heat, doesn't mean that low temperatures are always preferred. You can also freeze to death. Arsenic is a necessary micronutrient, but you shouldn't consume mass quantities. It's ALWAYS about the amount. --Khajidha (talk) 17:58, 10 July 2021 (UTC)


 * The health benefits (serotonin release) are only triggered by visible light. This does not include UV radiation, which is electromagnetic radiation outside the visible spectrum (the small portion of the electromagnetic spectrum of light that is visible to the human eye), as shown in this image. --Lambiam 18:50, 10 July 2021 (UTC)
 * Vitamin D production uses UV, but very small amounts are sufficient. And, again, higher levels cause deleterious effects.--Khajidha (talk) 19:45, 10 July 2021 (UTC)


 * Did you read through the second link you posted? It clearly explains the benefits and risks of UV exposure. It even goes as far as saying, "According to [the World Health Organization], getting anywhere from 5 to 15 minutes of sunlight on your arms, hands, and face 2-3 times a week is enough to enjoy the vitamin D-boosting benefits of the sun. Note that the sun must penetrate the skin. Wearing sunscreen or clothing over your skin won’t result in vitamin D production. But if you’re going to be outside for more than 15 minutes, it’s a good idea to protect your skin. You can do that by applying sunscreen with a sun protection factor (SPF) of at least 15. Wearing a protective hat and shirt can also help." What has 5G got to do with anything? What are you actually asking? nagualdesign 20:09, 10 July 2021 (UTC)

I included 5G because my question based on frequencies which are exposed to humans. Rizosome (talk) 07:20, 11 July 2021 (UTC)
 * All electromagnetic radiation has frequencies. That is a basic property of light/EM radiation. --OuroborosCobra (talk) 14:40, 12 July 2021 (UTC)
 * Your title has a link to 5G. I assume you did not intend that. Ultraviolet has an upper frequency of around 750 THz? Martinevans123 (talk) 14:49, 12 July 2021 (UTC)