A sound wave has a frequency of 250 Hz. What is its period?
Answer and explanation
Correct answer: D. 0.004 s
- Step 1: T = 1 ÷ f.
- Step 2: 1 ÷ 250 = 0.004 s.
Answer
0.004 s.
Why not the others: 250 s: the frequency was used as the period. 0.4 s: the decimal was misplaced. 62 500 s: the frequency was squared.
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