# Two gaseous molecules  and  are traveling towards each other. Let the mean free path of the molecule be  and  be the collision number with other molecules  at pressure 1 atm. Answer the following questions The free path of a gas molecule is the distance a) Between the two opposite walls of the container b) That molecules travel in the second c) Through which a molecule moves between two successive collisions d) None of these

## Question ID - 103086 :- Two gaseous molecules  and  are traveling towards each other. Let the mean free path of the molecule be  and  be the collision number with other molecules  at pressure 1 atm. Answer the following questions The free path of a gas molecule is the distance a) Between the two opposite walls of the container b) That molecules travel in the second c) Through which a molecule moves between two successive collisions d) None of these

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Answer Key : (c) -

(c)

distance between two successive collisions

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The constant motion and high velocities of gas particles lead to some important practical consequences. One such consequence is that gases mix rapidly when they come in contact. Take the stopper off a bottle of perfume, for instance, and the odour will spread rapidly through the room as perfume molecules mix with the molecules in the air. This mixing of different gases by random molecular motion and with frequent collision is called diffusion. A similar process in which gas molecules escape without collision through a tiny hole into a vaccum is called effusion. Both the processes follow Graham’s law which is mathematically put as . The average distance travelled by molecules between successive collisions is called mean free path

Answer the following questions on the basis of the above information:

The stopcocks of the bulbs  (containing ) and  (containing ), both under identical conditions, are opened simultaneously. White fumes of , are formed at point . If =36.5 cm, then  is approximately

 a) 18.0 cm b) 25.0 cm c) 20.0 cm d) 36.5 cm