Chemistry

Problem

The atomic masses of He and Ne are 4 and 20 a.m.u., respectively. The value of the de Broglie wavelength of He gas at

-73^\circ\text{C}

is "

M

" times that of the de Broglie wavelength of Ne at

727^\circ\text{C}

M

is : [JEE (Advanced) I 2013]