NEET-XII-Physics
24: Kinetic Theory of Gases
- #2Consider a mixture of oxygen and hydrogen kept at room temperature. As compared to a hydrogen molecule an oxygen molecule hits the wall
(a) with greater average speed
(b) with smaller average speed
(c) with greater average kinetic energy
(d) with smaller average kinetic energy.digAnsr: bAns : The average speed of molecules is given by `` \sqrt{\frac{8kT}{\pi m}}``. We observe that greater the mass, lesser is the average speed of the molecule. Since an oxygen molecule is heavier than a hydrogen molecule, the oxygen molecule will hit the wall with smaller average speed.
Thus,
(b) is the correct answer.