First slide

Rms speed

Question

The rms velocity of hydrogen gas molecules at NTP is $V m s^{- 1}$ . The gas is heated at constant volume till the pressure becomes four times. The final rms velocity is

Easy

A

$\frac{V}{2}$
B

V
C

2V
D

4V

Solution

$P \propto T . P$ is increased by a factor of 4 , Therefore T also increases by a factor of 4. since C $\infty \sqrt{T},$ C is increased by a factor of 2.

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