Question

The root mean square speed of gas molecules

• A. is the same for all gases at the same temperature
  
• B. depends on the mass of the gas molecule and its temperature
  
• C. is independent of the density and pressure of the gas
  
• D. depends only on the temperature and volume of the gas

Answer 1

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
$V_{rms}=\sqrt{\frac{3KT}{m}}$
where m is the mass of the molecule of the gas, T is its absolute temperature and K is the Boltzmann's constant. Hence, the correct choice is (b).