HELP????????????????????

Biology
Tutor: None Selected Time limit: 1 Day

UVA

a. longer wave

b shorter wave

c 95%/ 5% UVB

d heat

Sep 25th, 2015

Thank you for the opportunity to help you with your question!

a. Longer wave

Note: 

Ultraviolet (UV) light is an electromagnetic radiation with a wavelength from 400 nm to 10 nm, shorter than that of visible light but longer than X-rays. Though usually invisible, under some conditions children and young adults can see ultraviolet down to wavelengths of about 310 nm, and people with aphakia (missing lens) can also see some UV wavelengths. Near-UV is visible to a number of insects and birds.

UV radiation is present in sunlight, and is produced by electric arcs and specialized lights such as mercury-vapor lamps,tanning lamps, and black lights. Although lacking the energy to ionize atoms, long-wavelength ultraviolet radiation can cause chemical reactions, and causes many substances to glow or fluoresce. Consequently, biological effects of UV are greater than simple heating effects, and many practical applications of UV radiation derive from its interactions with organic molecules.

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Sep 25th, 2015

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Sep 25th, 2015
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Sep 25th, 2015
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