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JAMB Physics 2000 Question 44

Question 44

Modern Physics

If the frequency of an emitted x-rays is 1.6 × 1016 Hz, the accelerating potential is [e = 1.6 × 10−19 C, h = 6.63 × 10−34 J s]

  1. A.6.6 V
  2. B.66.3 V
  3. C.663.0 V
  4. D.6630.0 V
Show the answer and explanation

Answer: B (66.3 V)

Explanation

eV = hf, so V = 6.63 × 10−34 × 1.6 × 1016 ÷ 1.6 × 10−19 = 66.3 V.