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Describing periodic motion needs period, frequency, amplitude, phase and:
ADisposition
BDisturbance
CDisplacement
DDispleasure
Answer & Solution
Correct answer: C. Displacement
1. A handful of concepts are listed as fundamental to this description.
2. Four of them concern how far, how fast and where in the cycle.
3. The list is period, frequency, displacement, amplitude and phase.
4. So the missing one is displacement.
_Source: NCERT Class XI Physics Part II, Ch 13 'Oscillations'_
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