A) less than \[3\times {{10}^{-7}}m\]
B) equal to \[3\times {{10}^{-7}}m\]
C) more than \[3\times {{10}^{-7}}m\]
D) all of the above
Correct Answer: A
Solution :
Ozone layer extends from 30 km to nearly 50 km above the earths surface in ozone sphere. This layer absorbs the major part of ultraviolet radiations coming from the sun and does not allow them to reach the earths surface. The range of ultraviolet radiations is 100 \[\overset{o}{\mathop{A}}\,\]to 4000 \[\overset{o}{\mathop{A}}\,\]. Thus, .it blocks the radiations of wavelength less than \[3\times {{10}^{-7}}m\] (or 3000 \[\overset{o}{\mathop{A}}\,\]).
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