An electron is accelerated from rest through a potential difference of 100 V. What is its resulting kinetic energy in joules? (e = 1.6 × 10⁻¹⁹ C)

Answer and explanation

Correct answer: B. 1.6 × 10⁻¹⁷ J

  1. Step 1: Relate kinetic energy gain to potential difference: .
  2. Step 2: Compute: .
Answer
1.6 × 10⁻¹⁷ J.
Why not the others: 3.2 × 10⁻¹⁷ J doubles the charge; 8.0 × 10⁻¹⁸ J halves the energy; 1.6 × 10⁻¹⁹ J is for 1 V.

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