阿摩線上測驗
7. Two waves
are sent to a long string to create a standing wave. Let x be positive (x ≥ 0). Where is the first node (the smallest value of x)?
(A) 5 cm
(B) 10 cm
(C)50 cm
(D) 100 cm
(E) 200 cm
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統計： A(0), B(0), C(5), D(7), E(0) #3084466
統計： A(0), B(0), C(5), D(7), E(0) #3084466
