40 mm The rms speed of helium in ms-' (atomic mass = 4.0 g mol-1) at 400 K is 1) 1580 2) 15.8 3) 28 4)

The rms speed of helium in ms^(-1) (atomic mass = 4.0g mol^(-1) ) at 400K is

At what temperature is the root mean square speed of an atom in an argon gas cylinder equal to the rms speed of a helium gas atom at -20^(@)C ? (atomic mass of Ar = 39.9 u, of He = 4.0 u) .

At what temperature is the root mean square speed of an atom in an argon gas cylinder equal to the rms speed of a helium gas atom at - 20 ^(@)C ? (atomic mass of Ar = 39.9 u, of He = 4.0 u).

At what temperature is the root mean square speed of an atom in an argon gas cylinder equal to the r.m.s. speed of a helium gas atom at -20^(@) C ? (Atomic mass of Ar = 39.9 u, of He = 4.0 u).

At what temperature is the root mean square speed of an atom in an argon gas cylinder equal to the r.m.s. speed of a helium gas atom at -20^(@) C ? (Atomic mass of Ar = 39.9 u, of He = 4.0 u).