試題詳解

11. Consider radio waves (r), visible light (v), infrared (i), X-rays (x), and ultraviolet (u). In order of increasing frequency, they are ______.
(A) r, v, i, x, u
(B) r, i, v, u, x
(C) i, r, v, u, x
(D) x, u, v, i, r
(E) r, i, v, x, u