12. Which of the following statements is(are) true?
I. An excited atom can return to its ground state by absorbing electromagnetic radiation.
Ⅱ.energy of an atom is increased when electromagnetic radiation is emi
III. The energy of electromagnetic radiation increases as its frequency increases.
IV. An electron in the n = 4 state in the hydrogen atom can go to the n = 2 state by emitting electromagnetic radiation at the appropriate frequency.
V. The frequency and wavelength of electromagnetic radiation are inversely
proportional to each other.
(A) II, III, IV
(B) III, V
(C) I, II, III
(D) III, IV, V
(E) I, II, IV
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