Question

Crystal structures of two metals A and B are two-dimensional square lattices with same lattice constant a. Electrons in metals behave as free electrons. The Fermi surfaces corresponding to A and B are shown by solid circles in figures.

The electron concentrations in A and B are $n_A$ and $n_B$, respectively. The value of $(n_B / n_A)$ is:

• A. 3
• B. 2
• C. $3\sqrt{3}$
• D. $\sqrt{2}$

Answer 1

Answer: (B)

2

Answer 2

The correct option is (B) :2