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JAMB Physics 1997 Question 31

Question 31

Waves

The diagram above shows two wave forms P and Q at a particular instant of time. The two waves will interfere

Diagram for this question
  1. A.destructively to produce a wave of a larger amplitude
  2. B.destructively to produce a wave of a smaller amplitude
  3. C.constructively to produce a wave of a larger amplitude
  4. D.constructively to produce a wave of a smaller amplitude
Show the answer and explanation

Answer: C (constructively to produce a wave of a larger amplitude)

Explanation

P and Q have crests and troughs at the same places (in phase), so they add up constructively, giving a larger amplitude.