Question

Which wavelength of the harmful UV radiations is prevented by the ozone layer from entering the earth’s atmosphere?
a) $200 – 310 nm$
b) $400 – 700 nm$
c) $320 – 400 nm$
d) more than $700 nm$

Answer 1

Hint : The ozone layer is a protection that protects the Earth from the dangerous rays of the sun. Generally, the ozone layer prevents radiation of wavelength less than $290$ nm, approximately equal to $300$ nm. The reduction of the ozone layer leads, on average, to an increment in ground-level ultraviolet radiation because ozone is a robust absorber of UV radiation.

Complete step-by-step solution:
The sun releases radiation over a wide variety of energies. The various kinds of energy, or radiation, are arranged according to wavelength, estimated in nanometres: the smaller the wavelength, the higher energetic the radiation. The principal sorts of radiation are gamma rays, X rays, UV, visible light, infrared radiation, microwaves, and radio waves to reduce energy. There are three classes of UV radiation:
UV-A, between $320$ and $400$ nm
UV-B, between $280$ and $320$ nm
UV-C, between $200$ and $280$ nm
Ultraviolet radiation is one kind of radiant energy emanating from the sun. Generally, the smaller the wavelength, the higher damaging UV radiation can be if it arrives at the Earth in sufficient quantity. UV-A is the most extended wavelength kind of UV radiation and gives the Earth the most significant quantity. Most UV-A rays move right by the ozone layer in the stratosphere. UV-B radiation can be hazardous. Providentially, most of the sun's UV-B radiation is received by ozone in the stratosphere. UV-C radiation is probably the most damaging because it is very forceful. Providentially, all UV-C is occupied by oxygen and ozone in the stratosphere and never arrives at the Earth's surface.
Option (a) is correct.

Note: Some of this UV radiation (UV-B) is particularly effective in creating damage to living people, for example, skin cancer, sunburn, and eye damage to people. The quantity of solar UV radiation received at any unique location on the Earth's surface depends on the sun's position above the horizon, the ozone in the environment, and slight cloudiness and pollution. Scientists admit that, in the lack of changes in clouds or pollution, reductions in atmospheric ozone led to increments in ground-level UV radiation.