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The amplitude of SHM is the magnitude of the maximum:

ATime period
BPhase angle
CDisplacement
DFrequency
Answer & Solution
Correct answer: C. Displacement
1. The particle swings out to a furthest point on each side. 2. The size of that furthest excursion is measured. 3. It is the maximum displacement, the amplitude. _Source: syllabus Physics Part II, Chapter 14, Oscillations._
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