55. Hydrogen gas `(H2)` and oxygen gas `(O2)` are in thermal equilibrium. How does the average speed of the hydrogen molecules compare to the average speed of oxygen molecules?
(A) equal
(B) 4 times greater
(C) 8 times greater
(D) 16 times greater
(A) equal
(B) 4 times greater
(C) 8 times greater
(D) 16 times greater