Are there UV rays during the night at all? And do clouds block UV Rays? Do you still get UV Rays in shadow?

Question

Like it sez on the question, are there any UV Rays during the night. As in any at all? and also if it was a cloudy day would the UV rays from the sun still reach you? If you're in shadow do the UV rays still get to you even if the light doesn't? And how much UV rays does glass, normal window galss, let through it? THX ;)

Answer 1

Best Answer - Chosen by Voters

UV rays are present everywhere, even inside. clear glass blocks very little

Answer 2

no, there are no uv rays at night because the sun is not casting them, no clouds do not block uv rays the only thing that can is the ozone layer which is formed by 2 oxygen and 1 hydrogen i believe, it works like the oppisite of water, however cfc's (chloroflorocarbons) that used to be in arosol cans and freezers would break down the ozones particals into 1 oxygen, and one hydogen rendering them useless to protect us from uv rays. as for shadow, no it does not allow uv rays as long as you are 100% covered by it, how it worls is the suns heat sends out uv rays, these rays can cause skin cancer but only if you are in them. therefore if you are in a shadow, you will be covered. now yes glass does allow uv rays through, as to how much i would have to guess that the glass particals would trap a good amount of it, seeing how nobody has died of cancer from looking out the window, i would say that it would stop 80% of it, but im not a scientist and do not know, however the other part of the question im at least 95% that it is accurate.

Source(s):

my 4th grade science class

Answer 3

No there is no uv in the night .and the clouds dont protect you from uv.

Answer 4

Glass completely blocks ultraviolet light. Clouds blocks most of it by reflecting them.

To get ultraviolet light, you need a source. The sun is a source, but you get a small amount of UV light from some natural processes.Hence, you might observe UV light in the dark.

Most UV light is absorbed when it hits the ground. A noticeable exception is snow. In Norway, you can get really sunburned on a cloudy winter day because the snow and clouds reflects almost all of the sun's UV light. That's why you wear sun block in a blizzard.

Answer 5

Hm... There are UV rays all the time.
Yes they pass teh clouds
Normal glass lets all of it pass through