9.The figure shows the displacement y of a wave at a given position as a function of time and the displacement of the same wave at a given time as a function of position. Determine the frequency of the wave.

(A) 4.0 Hz
(B) 3.0 Hz
(C) 0.50 Hz
(D) 0.33 Hz
(E) 0.25 Hz
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統計: A(2), B(0), C(0), D(0), E(17) #3081249
統計: A(2), B(0), C(0), D(0), E(17) #3081249