20. In which of the following is electromagnetic radiation listed correctly in increasing order of wavelength (lowest wavelength first)?
(A)X-rays ＜ infrared ＜ ultraviolet
(B)Microwave ＜ visible ＜ infrared
(C)Visible ＜ microwave ＜ infrared
(D)Ultraviolet ＜ visible ＜ infrared

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