a) What is the root-mean-square speed for a collection of helium-4 atoms at 311 K?
b) What is the root-mean-square speed for a collection of helium-3 atoms at 311 K?
(Vrms)^2 = 3 k T/M
M is the atom's mass in kg
k is the Boltzmann constant in J*K
T is temperature in K
Vrms will be in m/s