Internal energy of n1 mol of hydrogen of temperature T is equal to the internal energy of n2 mol of helium at temperature 2T. The ratio n1/n2 is

Internal energy of n moles of an ideal gas at temperature T is given byU=f2nRT (f= degrees of freedom )          U1=U2          f1n1T1=f2n2T2∴     n1n2=f2T2f1T1=3×25×1=65 Here, f2= degrees of freedom of He=3 and, f1= degrees of freedom of H2=5