The number of repetitions per unit time is given by the reciprocal of the:
APeriod
BPerson
CParcel
DPardon
Answer & Solution
Correct answer: A. Period
1. Period and frequency describe the same repetition from two sides.
2. One counts time per cycle and the other cycles per time.
3. The reciprocal of T gives the number of repetitions per unit time.
4. So frequency is the reciprocal of the period.
_Source: NCERT Class XI Physics Part II, Ch 13 'Oscillations'_
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