A source vibrates with a frequency of 20 Hz. What is its period?
Answer and explanation
Correct answer: D. 0.05 s
- Step 1: Period T = 1/f. Step 2. T = 1/20 = 0.05 s. Answer: 0.05 s. Why not the others: 20 s is what you get if you give the frequency. 0.1 s is what you get if you double the period. 10 s is what you get if you halve the frequency.
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