b
\({({v_{rms}})_H} = \sqrt {\frac{{3RT}}{{{M_H}}}} \,\,\,\therefore \,1930 = \sqrt {\frac{{3R \times 300}}{2}} \,\,\,\,\,....(1);\,\,\,\,\)

\(\,{({v_{rms}})_o} = \sqrt {\frac{{3R \times 900}}{{32}}}  = \frac{{\sqrt 3 }}{4}\sqrt {\frac{{3R \times 300}}{2}}  = \frac{{\sqrt 3 }}{4} \times 1930\,\,\,\,\,\,{\text{(}}\because {\text{ }}\)સમી.(\(1\)) ની કિંમત મુક્તા ) \({\text{ =  836 m/s}}\)