Light is emitted by electrons when they drop from one energy level to a lower level. Which transition results in the emission of light with the greatest energy?

The emitted light’s energy equals the energy difference between the electron’s starting and ending levels. The transition from level 4 to level 2 spans a larger drop than either level 2 to 1 or level 3 to 2, so it releases the greatest-energy light. The correct choice is level 4 to level 2.

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