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Question

The root mean speed of gas molecules


  1. Is the same for all gases at the same temperature

  2. Depends on the mass of the gas molecule and its temperature

  3. Is independent of the density and pressure of the gas

  4. Depends only on the temperature and volume of the gas


Solution

The correct option is B

Depends on the mass of the gas molecule and its temperature


The root mean square speed of the molecules of a gas is given by

                                vrms = 3kTM 

Where m is the mass of the molecule of the gas, T its absolute temperature and k is the Boltzmann's  constant. Hence the correct choice is (b)

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