UPSEE Solved Model Paper 6

Given, atom is Helium, He.
Mass of He atom, M =Atomic weight / Avogadro's no: = 4 x 1023 / 6 x 1023
de-Broglie wavelength of helium atom,λ = ?
Temperature, T = 25°C = 25 + 273 = 298K
Boltzmann's constant, k = 1.38 x 10−23 J mol/K de-Broglie wavelength of helium atom,λ = h/√3mkT
=
= 0.73 × 10−10 m
= 7.34 × 10−11 m