The ozone layer absorbs

Options

A. ultraviolet radiations
B. unfra-red radiations
C. X-rays
D. all the radiations.

Answer

A

Explanation

The time taken by the electromagnetic wave to move through a distance of 60 cm is
`t=(60cm)/(c)=2xx10^(-9)s`. The energy contained in the 60 cm length passes through a cross section of the beam in `2xx10^(-9)`s. But the energy passing through any cross section in `2xx10^(-9)s` is
`U=(4mW)xx(2xx10^(-9)s)`
`=(4xx10^(-3) J//s) xx(2xx10^(-9)s)`
This is the energy contained in 60 cm length.