Multiple choice

Calculate the energy acquired in electron volts when a particle having a charge of 20 electrons on it falls through a potential difference of 100 volts.

  1. 5120 eV

  2. 2000 eV

  3. 20 eV

  4. 0.05 eV

  5. 0.0005 eV
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Charge = q = 20 e = 20 x 1.6 x 10-9 = 32 × 10-19 C Potential difference = ΔV = 100 V We know that: E = q v ΔV = (32 × 10-19) (100) = 3200 × 10-19 Joules Since, 1eV = 1.6 × 10-19 C E = 3200 × 10-19 / 1.6 × 10-19 = 2000 eV  

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