Question

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 the above

Answer 1

The correct option is A

less than $3\times {10}^{-7}m$

Explanation for the correct option:

In the case of option A,

1. The ozone layer acts as a barrier to defend the planet from the sun's damaging radiation of high frequency. The ozone layer typically absorbs radiation with a wavelength less than $2.9\times {10}^{-7}m$, or around $3\times {10}^{-7}m$, depending on the usage of CFCs.
2. Radiation with a wavelength shorter than $3\times {10}^{-7}m$ is blocked by the ozone layer.

Hence, the correct option is A.