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The gas molecules randomly move in all directions and collide with each other and with the wall of the container. It is difficult to determine the speed of an individual molecule but it has become possible to work out the distribution of molecules among different molecular speeds. This is known as Maxwell Boltzmann distribution. Consider the following graph about Maxwell's distribution of speeds at two different temperatures T subscript 1 end subscript and T subscript 2 end subscript :

The shaded area represents:

  1. number of molecules having speed between u subscript 1 end subscript and u subscript 2 end subscript    
  2. number of molecules having speed less than the most probable speed    
  3. number of molecules having V subscript r m s end subscript at T subscript 1 end subscript    
  4. fraction of total molecules having average speed    

The correct answer is: number of molecules having V subscript r m s end subscript at T subscript 1 end subscript

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