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Consider a proton (m = 1.6726219 × 10-27 kg) confined in a box of length 10.000 pm. What is the energy difference
between the n = 1 and n = 2 states of the proton-in-a-box?
Report your answer in units of 10-18 J (that is, if the energy is 5.00 × 10-18 J, you would report it as "5.00").

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