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An electron in a rigid box absorbs light. The longest wavelength in the absorbstion spectrum is 600nm. How long is the box?

[tex]\lambda[/tex] = c/f

E=hf

E= n^{2}*((h^{2})/(8mL^{2}))

so i figured out E from the wavelength to frequency formula and the E=hf. then i just Solved for L. i used n=1 and i keep getting the wrong answer. Should n be a different value?

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# Quantum! Particle in a box problem! HELP

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