14. A standing wave is oscillating at 690 Hz on a string, as shown in the figure. What is the speed of traveling waves on this string?
(A) 140 m/s
(B) 210 m/s
(C) 280 m/s
(D) 340 m/'s
(E) 410 m/s. 60cm
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統計: A(0), B(0), C(15), D(0), E(0) #3093855
統計: A(0), B(0), C(15), D(0), E(0) #3093855