At what temperature is the r.m.s. velocity of a hydrogen molecule equal to that of an oxygen molecule at $47^\circ\mathrm{C}$? (1) 80 K (2) 73 K (3) 3 K (4) 20 K
At what temperature is the r.m.s. velocity of a hydrogen molecule equal to that of an oxygen molecule at $47^\circ\mathrm{C}$?\\
(1) 80 K\\
(2) 73 K\\
(3) 3 K\\
(4) 20 K