A periodic transverse wave is established on a string such that there are exactly two cycles tra...

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A periodic transverse wave is established on a string such that there are exactly two cycles traveling along a \( 3.0-\mathrm{m} \) section of the string. The crests move at \( 20.0 \mathrm{~m} / \mathrm{s} \).
What is the frequency of the wave?
(A) \( 0.67 \mathrm{~Hz} \)
(B) \( 1.33 \mathrm{~Hz} \)
(C) \( 13 \mathrm{~Hz} \)
(D) \( 30 \mathrm{~Hz} \)
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