Two waves of equal frequency and amplitude meet at a point with a phase difference of . What is the resulting amplitude?
Answer and explanation
Correct answer: B. Zero
Waves a half-cycle out of phase cancel completely (destructive interference).
Answer: Zero.
Why not the others: Equal to one wave: that happens with a different phase difference. Twice that of one wave: that is constructive interference. Half that of one wave: the waves cancel fully.
Answer: Zero.
Why not the others: Equal to one wave: that happens with a different phase difference. Twice that of one wave: that is constructive interference. Half that of one wave: the waves cancel fully.
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