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When crest of one wave falls over the trough of the other wave this phenomenon is known as________________?

Correct answer: C. destructive interference

  • A. polarization
  • B. constructive interference
  • C. destructive interference
  • D. diffraction

Explanation

A crest meeting a trough gives displacements in opposite directions, so they cancel partially or completely by destructive interference. Option b is the likely mistake because constructive interference occurs when crest meets crest or trough meets trough.

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About Superposition and Interference

Superposition states that overlapping waves produce a resultant displacement equal to the algebraic sum of their individual displacements. Interference covers constructive and destructive interference, phase difference, path difference, coherent sources, and conditions for maxima and minima. It differs from diffraction, which involves spreading around openings or obstacles.

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