Q. Ozone layer blocks the radiations of wavelength
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 these
Explanation
(a) Ozone layer extends from 30 km to nearly 50 km above the earth’s 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 earth’s surface.
The range of ultraviolet radiations is $100\ \mathring{\mathrm{A}}\ to\ 4000\ \mathring{\mathrm{A}}.$ Thus, it blocks the radiations of wavelength less than $3 \times 10^{- 7}\ m\ (or\ 3000\ \mathring{\mathrm{A}}).$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.