A hydrogen molecule (diameter 1.0  108 cm), traveling at the rms speed, escapes from a 4000 K furnace into a chamber containing cold argon atoms (diameter 3.0  108 cm) at a density of 4.0  1019 atoms/cm3.

(a) What is the speed of the hydrogen molecule?

(b) If it collides with an argon atom, what is the closest their

centers can be, considering each as spherical? (c) What is the initial

number of collisions per second experienced by the hydrogen molecule?