A monochromatic laseris exciting hydrogen atoms from the n=2n=2 state to then=5n=5 state.

Part A

What is the wavelength ? of the laser?

Express your answer to three significant digits innanometers.

Part B

Eventually, all of the excited hydrogen atoms will emit photonsuntil they fall back to the ground state. How many differentwavelengths can be observed in this process?

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??lambda =

nmnm

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