eli5: How does my UV flashlight have a higher uv index rating than the Sun

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When I measured the sun, it gave a UV index of 6. When I measured the uv flashlight, it gave a uv index of 196. Is the sun not more powerful in UV than the flashlight?

In: Physics

13 Answers

Anonymous 0 Comments

The sun IS more powerful in UV than the flashlight – *at its source*. But it’s so far away that the energy transmitted by the sun is dissipated and/or blocked by all manner of things.

It’s the same way the sun makes your days warm and toasty but a fire can burn you. Or how someone yelling at you from the other side of the house is softer than someone whispering right next to your ear.

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