19. Two harmonic waves traveling in opposite directions interfere to produce a standing wave cribed by y = 2 sin 4x cos(3t) where x is in m and t is in s. What is the speed (in n interfering waves?
(A)0.75
(B)0.25
(C)1.33
(D) 12
(E)3.0

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統計: A(8), B(0), C(1), D(0), E(0) #3224665

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