Question: Photon in a Dye Laser all electrons in a long organic molecule used in a dye laser behaves approximately like a particle in a box

Photon in a Dye Laser all electrons in a long organic molecule used in a dye laser behaves approximately like a particle in a box with width 4.18nm. What is the wavelength of the photon emitted when the electron undergoes a transition?
(a) From the first excited level to the ground level and
(b) From the second excited level to the first excited level?

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