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When electrons fall from higher to lower energy levels, the lost energy can be emitted as a photon. For example, when an electron falls from the fourth to the third shell in the diagram below, Photon 1 is emitted.

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Based on the diagram above, which photon has the longest wavelength?

A

Photon 1.

B

Photon 2.

C

Photon 3.

D

All of these photons have the same wavelength.

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