The place where compressions of a sound wave combine with the rarefactions of another sound wave and cancel each other is called a:
Correct answer: D. node point.
- A. dead beat.
- B. null point.
- C. zero point.
- D. node point.
Explanation
Where a compression of one sound wave meets a rarefaction of another, the two cancel and leave a point of zero disturbance, which the FSc course calls a node. A dead beat describes a damped meter needle that settles without oscillating, and zero point is not a term used for destructive interference.
This question appeared on the UHS MDCAT 2026 paper, which you can sit online with every answer explained.
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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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