Question: A ruby laser uses the photons emitted by Cr +3 ions that are embedded in a crystal of Al 2 O 3 (instead of in

A ruby laser uses the photons emitted by Cr⁺³ ions that are embedded in a crystal of Al₂O₃ (instead of in a gas, as with a helium–neon laser). The light emitted by a ruby laser has a wavelength of approximately 694 nm.

(a) What is the frequency of this light?

(b) What is the spacing, in electron-volts, between the energy levels in Cr⁺³ that are responsible for these photons?

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