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Select the correct arrangement of the ty...

Select the correct arrangement of the types of ultraviolet radiations according to the intensity of their effect on human skin

A

`UV-A gt UV-B gt UV-C`

B

`UV-B gt UV-C gt UV-A`

C

`UV-C gt UV-B gt UV-A`

D

`UV-A gt UV-C gt UV-B`

Text Solution

Verified by Experts

The correct Answer is:
B
Ultraviolet radiations are of three types -UV-C (100-280 nm), UV-B (280-320 nm) and UV-A (320-390 nm). Shorter ultraviolet radiations (UV-C) ar absorbed by the atmosphere. The longer ones are not much hjarmful. The intermediate or UV-B are harmful as well as capable of deep penetration. Thinning of ozone layer increases the amount of UV-B radiations reaching the earth. UV-B radiations damage skin cells cause ageing of skin and skin cancer.
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