The r.m.s. speed of the molecules of an enclosed gas is $x$. what will be the r.m.s. speed, if the pressure of the gas is doubled but the temperature is kept constant?
$x$
$\dfrac{x}{2}$
2$x$
$\sqrt{x}$
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The r.m.s. velocity of the molecules in the sample of helium is 5/7th that of the molecules in the sample of hydrogen. If the temperature of the hydrogen sample is 0°C that of helium is