13. Place the following types of electromagnetic radiation in order of increasing frequency.
(A) microwaves ＜ visible light ＜ X-rays
(B) X-rays ＜ visible light ＜ microwaves
(C) microwaves ＜ X-rays ＜ visible light
(D) X-rays ＜ microwaves ＜ visible light

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