Free-Electron Theory of Metals: Silver Has a Fermi Level (Energy)

question 2

Multiple Choice

Free-electron theory of metals: Silver has a Fermi level (energy) of 5.5 eV. At 0 K, at what speed would the electrons be moving if they had kinetic energy equal to the Fermi energy? (This speed is known as the Fermi speed.) (m_el = 9.11 × 10^-31 kg, 1 eV = 1.60 × 10^-19 J, h = 6.626 × 10^-34 J ∙ s)

• A) 1400 km/s
• B) 1.0 km/s
• C) 2.2 km/s
• D) 1100 km/s
• E) 3.5 km/s