Question

The Fermi enrgy of copper is 7 eV. (use h = 6.6 ×10−34JHz−1 , 1eV = 1.602×10−19J, me=9.1×10−31 kg )The Fermi velocity is ________

2.32×106 m/s


1.57×106 m/s


4.57×106 m/s


3.37×106 m/s

Answer 1

The Fermi velocity is

$$v_F=\sqrt{\frac{2E_F}{m}}=1.57·10^6\text{ m/s}.$$

Don't forget to convert eV to J before calculating!