A monochromatic laser is exciting hydrogen atoms from the n = 2 state to the n = 5 state.

What is the wavelength lambda of the laser? (nm)

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

What is the longest wavelength lambda_max that is observed?

What is the shortest wavelength lambda_min observed?

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