An electron and a photon each have a wavelength of 1.00 nm. Find: (a) Their momenta, (b) The energy of the photon, and (c) The kinetic energy of the electron
(a) According to De Broglie hypothesis, p=λh =1∗10−96.62∗10−34=6.62∗10−25kg−m/s The value remains the same irrespective of electron or photon. (b) λ=1 nm E=hc/λe=1243.1eV=1.243 keV (c) Momentum, p=h/λ=6.63×10−25kgm/s K.E. of electron is P2/2m=2.415×10−19J=1.51 eV
