Question

The equivalent wavelength of a moving electron has the same value as that of a photon having an energy 6×10^-17.calculate the momentum

Answer 1

E = hc/lemda

lemda = hc/E
= hc /6 × 10^-17

wavelength of photon = wavelength of electron = hc/6 × 10^-17

according to De-broglie theory ,
wavelength = h/P
where p is momentum of electron .

P = h/wavelength
= h/hc/(6 × 10^-17)
=6 × 10^-17/c
= 6 × 10^-17/3 × 10^8
= 2 × 10^-25 kgm/s