Question

- Guller : wird in approximate incidht herzy for which a Crystal lattice would make a good diffraction grating for (a) Photons, (b) neutrons (mn C? 939 MeV) - Question 2. In an one-dimhsional iflriconductor material With lattice Constant of a the herzy function of Conduction hond is Ec (k) and of valence bond is EV(K), Ec (K) – ha ke + ħ? (K-Kqja, Ev (K) = h? Ki - 3 h?k? omo mo Id mo is the electron moss in fiel spole, Kz Il/a, a=0.314nm, find : 4 The forbidden bond gap chergy Effect moss at the bottom of Conduction bond. ( Effect moss at the top of wallace band

Answer 1

as per HomeworkLib guidelines I have done your first question only.

The periodicity of a caystal lattice enables it to act as diffraction grating to wores. since typical lattice constant in a crystal is about 10-10 m (1 Å h diffraction can take place on a crystal when a of incident particles is less than 10-10 m. ax for protons - E= ho-hc = 6.624 X0 34 x 3 x 100 = 1.98x10-155 - 12420 ev by for newbons The Kinetic energy (corsespording) 10-10 = 8.2 X10-2 ev

Please like and comment.

Thank you