Discussion
A musician hits a drum 90 times in a minute. The time period of hit is
Answer: E
The time period is 0.67 s.
90 hits in 60 s means the frequency is \(\frac{90}{60} = 1.5\) Hz. The period is its reciprocal.
\[ T = \frac{60}{90} = \frac{2}{3} \approx 0.67\ \text{s} \]
1.5 s is the frequency in hertz mistaken for the period. 1.34 s doubles the period, and 0.33 s halves it.
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