Answer
The ratio of the radiation pressure to the atmospheric pressure is $~~4.7\times 10^{-11}$
Work Step by Step
In part (a), we found that the radiation pressure is $~~4.7\times 10^{-6}~Pa$
We can find the ratio of this radiation pressure to the atmospheric pressure:
$\frac{4.7\times 10^{-6}~Pa}{1.0\times 10^5~Pa} = 4.7\times 10^{-11}$
The ratio of the radiation pressure to the atmospheric pressure is $~~4.7\times 10^{-11}$
