uv rays is harmfull. true or false
Answers
Answer:
true.
hope it is helpful to you
TRUE
Ultraviolet (UV) Radiation and Sun Exposure
Radiation Facts
Too much ultraviolet radiation (UV) from sunlight is dangerous.
Nearly half of UV radiation is received between 10 a.m. and 4 p.m., when the sun’s rays are the strongest.
Even on a cloudy day, you can be sunburned by UV radiation.
We’ve all heard the phrase, “a healthy tan,” but there is no such thing. Tanning is your body's attempt to protect itself from being damaged by ultraviolet (UV) radiation.
On this page:
About Ultraviolet (UV) Radiation and Sun
What you can do
Where to learn more
About Ultraviolet (UV) Radiation and Sun Exposure
The sun sends energy to Earth in a few different ways: visible light that you can see, infrared radiation that you feel as heat, and rays of UV radiation that you can’t see or feel. Fortunately, the Earth’s atmosphere protects us from most UV radiation. While we need some exposure to sunlight to help our bodies make vitamin D, too much UV is dangerous.
Image of UV Radiation and Sun Exposure Sunscreen Application
Broad-spectrum sunscreen provides protection from the sun’s Ultraviolet (UV) radiation.
Source: U.S. Centers for Disease Control and Prevention (CDC)
There are three types of UV rays:
Ultraviolet A rays (UVA)
The atmosphere does little to shield these rays—most UVA radiation reaches Earth’s surface.
UVA rays cause skin aging and eye damage, and can lower your body’s ability to fight off illness. UVA rays also contribute to the risk of skin cancer.
Ultraviolet B rays (UVB)
The Earth’s atmosphere shields us from most UVB rays—the amount of UVB rays that reach the Earth’s surface depends on latitude, altitude, time of year and other factors.
UVB rays cause sunburns, skin cancer, skin aging, and snow blindness (a sunburn to your cornea that causes a temporary loss of vision) and can lower your body’s ability to fight illness.
Ultraviolet C rays (UVC)
UVC rays do not reach the Earth’s surface because they are completely absorbed by the atmosphere.
Harmful effects from UVC rays are minimal.
The UV radiation that reaches the Earth’s surface is mostly UVA and some UVB. Almost half the daytime total of the more harmful UVB radiation is received between the hours of 10 a.m. and 4 p.m. Even on a cloudy day, you can be sunburned by UVB radiation.
Skin cancer is the most common form of cancer in the United States. While everyone should protect themselves against UV radiation, it is particularly important to protect children. Most of an average person's UV exposure from the sun occurs before the age of 18. Too much UV exposure or frequent sunburns, particularly during childhood, can make developing skin cancer more likely.