Physics Group - II  (3110018)

BE | Semester 1  Unit : Electronic Materials

Q1 (a) Winter-2019   Enlist the assumptions of free electron theory.

 Unit : Electronic Materials

Q1 (b) Winter-2019   Give the difference between Direct and Indirect band gap.

 Unit : Electronic Materials

Q2 (b) Winter-2019   The thermal and electrical conductivity of Cu at 20°C Kare 390 W m-1 K-1 and 5.87 x 107 (Ω m)-1 respectively. Calculate the Lorentz number.

 Unit : Electronic Materials

Q3 (b) Winter-2019   Fermi energy of a given substance is 7.9 eV. What is the average energy and speed of electron in this substance at 0 K?

 Unit : Electronic Materials

Q3 (b) Winter-2019   Consider two-dimensional square lattice of side 3.0 Å. At what electron momentum values do the sides of first Brillouin zone appear? What is the energy of free electron with this momentum?

 Unit : Electronic Materials