Quantum! Particle in a box problem! HELP!!! 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= n2*((h2)/(8mL2)) 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?