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R.m.s. velocity of helium molecules at N...

R.m.s. velocity of helium molecules at N.T.P. is 1300 m/s. Atmospheric pressure is = `1.013xx10^5 N/m^2`.Density of helium at N.T.P. is

A

`0.018 kg/m^3`

B

`0.18 kg/m^3`

C

`0.06 kg/m^3`

D

`0.6 kg/m^3`

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The correct Answer is:
A
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