Given the three statements below, which answer is best?
I. Although the wavelength of light and the frequency of light can change, the energy remains constant.
II. An important consequence of quantum theory is that the energy of various electronic states for atoms are at fixed discrete levels.
III. The energy of an electronic state for a hydrogen atom is dependent only on the principal quantum number n.

Question

Quizplus · Accepted Answer

Statement I is false because the energy of light is directly proportional to its frequency (E = hf, where h is Planck's constant and f is the frequency), meaning that as the frequency changes, the energy does too. Statement II is true as quantum theory indeed posits that the energy levels of electrons in atoms are quantized, not continuous. Statement III is also true, specifically for hydrogen atoms, where the energy levels are determined solely by the principal quantum number n.

Given the Three Statements Below, Which Answer Is Best