AIPMT MAINS 2009 Physics Drift Velocity and Mobility MCQ Question
The mean free path of electrons in a metal is 4 × 10⁻⁸ m. The electric field which can give on an average 2 eV energy to an electron in the metal will be in units of V/m:
5 × 10⁻¹¹
8 × 10⁻¹¹
5 × 10⁷
8 × 10⁷
Correct Answer
Detailed Explanation
The energy gained by an electron in an electric field is given by eEλ, where λ is the mean free path. Solving for E using the given energy and mean free path gives the correct answer.
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