UV 400 on sunglasses means they block all ultraviolet (UV) rays up to 400 nanometers, providing maximum protection against harmful UV radiation.
i read this article: http://www.mayoclinic.com/health/uv-protection/AN00832 but i found a pair of sunglasses that say UV protection 400 (no percent sign), now according to this article the glasses should be 95% - 99% what exactly is 400 UV? ----
Ray-Ban sunglasses typically offer 100% UV protection, as long as they are authentic. Ray-Ban lenses are often made with high-quality materials that block both UVA and UVB rays to protect your eyes from harmful sun exposure. It's important to check for the UV protection label on the sunglasses to ensure you are getting the full level of protection.
3/400 is already in lowest terms since the highest common factor of 3 and 400 is 1.
in terms of speed, 10 mph. in terms of 400 splits, 1:30 for each 400.
It is: 400/1000 or 2/5 in its lowest terms
3/400
It is: 400/5000 = 2/25 in its lowest terms
It is 54.5425%
It is: 9/400 in its lowest terms.
If you mean 7% of 400 then it is 28
147/400 in its lowest terms
1/4