A string with a fixed frequency vibrator at one end is subjected to varying tensions. When the tension is 20 N, a resonance with 3 antinodes results. What tension would cause a resonance with 2 antinodes in this string?
A. 30 N
B. 45 N
C. 80 N
D. 8.9 N
E. 13 N
Answer: B
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