problem1) Answer all the problems:
i) Derive an expression for wave number of Hydrogen Spectrum using bohr’s interpretation.
ii) Describe Pauli’s exclusion principle as applied to electrones in atoms
iii) What do you mean by Born–Harber Cycle? Describe.
iv) Lead is fcc structure and atomic radius is 0.175 nm. What is its volume and its face diagonal iln the unit cell?
v) State and describe Heisenberg’s Uncertainity principle.
problem2) Why the crystals are imperfect in nature? Describe types of imperfection in detail.
problem3) Describe electrons distribution solids on the basis of termi–direac statistics.
problem4) What are brillouin zones? Describe this phenomena in three dimensions.