If the period of a wave decreases, its frequency must

a. decrease
b. halve
c. stay the same
d. increase

Its frequency increases

Explanation:

Period is the time taken for an object to complete a full cycle or revolution.

It is the inverse of frequency

i.e Period = 1/frequency

Thus, decrease in period is proportional to an INCREASE in frequency

the answer is

c. parental

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