The principle of superposition states that when two waves meet, the resultant displacement at any point is
Correct answer: A. the vector sum of the individual displacements
- A. the vector sum of the individual displacements
- B. always zero
- C. always double one of them
- D. the larger of the two displacements
Explanation
Displacements add algebraically, so waves in phase reinforce and waves in antiphase cancel, and afterwards each wave continues unchanged. This single principle underlies interference, beats and stationary waves alike. Cancellation is only complete when the two amplitudes are equal as well as opposite.
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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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