engineering physics MCQ #5233

In a metal, the resistivity is 10^(-8) Ωm at 300 K. What is the mean free time if the Fermi velocity is 10^6 m/s?

engineering physics MCQ #5233

  1. Question 1

    Q1. In a metal, the resistivity is 10^(-8) Ωm at 300 K. What is the mean free time if the Fermi velocity is 10^6 m/s?

    • A) 2.5 * 10^(-14) s
    • B) 3.2 * 10^(-14) s
    • C) 4 * 10^(-14) s
    • D) 5 * 10^(-14) s

    Answer: 2.5 * 10^(-14) s

    Explanation: Using ρ = m / (n * e² * τ) and v_f = √(2E_f/m), we can find τ = m * v_f / (n * e² * ρ).