Physics - Heat & Thermo Question with Solution | TestHub

$v\propto \sqrt{\frac{T}{M}}$. For helium$\frac{300}{4}=75$

and for oxygen$\frac{1200}{32}=37.5$. The ratio of the speeds is

$\sqrt{0.5}$, so$v_O=\frac{v}{\sqrt{2}}$. C.