Hydrogen gas (H2) is at 0oC. The mass of a hydrogen atom is 1.67 x 10-27kg.
(a) What is the average de Broglie wavelength of the hydrogen molecules?
(b) How fast would an electron have to move to have the same de Broglie wavelength as the hydrogen? Do we need to consider relativity for this electron?
(c) What would be the energy of a photon having the same wavelength as the H2 molecules and the electrons? Compare it to the kinetic energy of the hydrogen molecule in part (a) and the electron in part (b).