An electron is trapped in a one‑dimensional box that is 476 nm wide. Initially, it is in the n = 4 energy level but, after a photon is absorbed, the electron is in the n = 8 energy level. What was the wavelength of the absorbed photon?

Explanation:

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Aform of energy that is reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space. there are many forms of  electromagnetic  energy including gamma rays, x rays, ultraviolet radiation, visible light, infrared radiation, microwaves and radio waves.

Letter a, because when there are unlike charges they will always attract to each other.