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8. A 2-m-long string is clamped at both ends. If the wave speed on the string is 60 m/s, what is the lowest standing-wave frequency?
(A) 7.5 Hz
(B) 10 Hz
(C) 15 Hz
(D) 20 Hz
(E) 30 Hz


8. A 2-m-long string is clamped at both ..-阿摩線上測驗