Calculate the pressure exerted by $10^{23}$ gas molecules each of mass $10^{-22}$ g in a container of volume one litre. The rms speed is $10^5 cm \;sec^{-1}$

Question

$\begin{array}{1,1}(a)\;3\times10^7dyne\;cm^{-2}\\(b)\;3.3\times10^4dyne\;cm^{-2}\\(c)\;3.3\times10^7dyne\;cm^{-2}\\(d)\;none\;of\;these \end {array}$