Post-UTME Physics 2009 Objective — Question 3
Question 3 of 10 from the Post-UTME Screening (Post-UTME) Physics 2009 Objective paper, with the correct answer and a full explanation.
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Two identical waves travelling in the same direction are superimposed. What should be the phase difference between the waves for maximum destructive interference to occur?
- A. 20°
- B. 45°
- C. 180°
- D. 225°
Explanation
Standard physics gives 180° (option C) for complete destructive interference between two identical waves; the source key marks 225° (option D), which appears to be an error.
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