I got 4V1

a fixed mass of gas at constant pressure occupies a volume.the gas undergoes a rise in temperature so that the Vrms of its molecule is doubled.What is the new volume

1 answer

Vrms = sqrt( R T/M)
to double Vrms I have to multiply T by 4

P V = n R T
P constant
new T = 4*old T
same P, n , R
so
new V = 4 * old V
so I agree.