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JAMB Physics 2000 Question 13

Question 13

Waves

I. Coherence II. Same frequency III. Same wavelength IV. Same intensity
Which of the conditions above are necessary to produce interference fringes?

  1. A.I, II and III
  2. B.I and III
  3. C.I, II and IV
  4. D.II and III
Show the answer and explanation

Answer: A (I, II and III)

Explanation

Interference needs coherent sources, which have the same frequency and wavelength; equal intensity is not required.