Ultraviolet (UV) radiation is a part of the electromagnetic spectrum that reaches the Earth from the Sun. It has wavelengths shorter than those of visible light, making it invisible to the naked eye. These wavelengths are classified as UVA, UVB, or UVC, with UVA the longest of the three at 317 nm to 400 nm. Both the U. S. Department of Health and Human Services and the World Health Organization have identified UV as a proven human carcinogen. Many experts believe that, especially for fair-skinned people, UV radiation frequently plays a key role in melanoma, the deadliest form of skin cancer, which kills more than 8000 Americans each year. UVB has a wavelength between 280 nm and 317 nm. Determine the frequency ranges of UVA and UVB.
Answers: 2
Physics, 22.06.2019 13:10
The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.
Answers: 3
Physics, 22.06.2019 13:20
Arrange the images in order to show how lake-effect snow occurs.
Answers: 2
Physics, 22.06.2019 15:00
Give an example in which the electrical energy changes to light energy
Answers: 1
Physics, 22.06.2019 17:00
If a negatively charged particle is placed at rest in an electric potential field that increases in the positive x-direction, what will the particle do? a. accelerate in the positive x-direction b. remain at rest c. accelerate in the negative x-direction
Answers: 3
Ultraviolet (UV) radiation is a part of the electromagnetic spectrum that reaches the Earth from the...
Geography, 28.10.2020 22:00
Business, 28.10.2020 22:00
Physics, 28.10.2020 22:00
Mathematics, 28.10.2020 22:00
Mathematics, 28.10.2020 22:00
Chemistry, 28.10.2020 22:00
Physics, 28.10.2020 22:00
Advanced Placement (AP), 28.10.2020 22:00
Biology, 28.10.2020 22:00
Mathematics, 28.10.2020 22:00
Mathematics, 28.10.2020 22:00