49. Given that the wavelengths of visible light range from 400 nm to 700 nm, what is the highest frequency of visible light? (c = 3.0 x 108 m/s)
(A) 3.1 x 108 Hz
(B) 7.5 x 1014 Hz
(C) 2.3 x 1020 Hz
(D) 4.3 x 1014 Hz
(E) 5.0 x 108 Hz.

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統計: A(0), B(16), C(0), D(1), E(0) #3093890

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