**Q1: **

In the free electron model of metals.

What is the percentage change in the energy between the state and the state with the next higher energy?

- A
- B
- C
- D
- E

**Q2: **

A cube of copper has edges 1.50 mm long. Calculate the number of electron quantum states in this cube whose energies are in the range 3.75 eV to 3.77 eV.

- A
- B
- C
- D
- E

**Q3: **

Copper at has a conduction band electron density of
m^{β3}.

What is the Fermi energy of the copper?

What is the Fermi temperature of the copper?

- A K
- B K
- C K
- D K
- E K

**Q4: **

What is the ratio of the density of states for electrons at 2.7 eV and at 0.27 eV?