An electron confined to a one-dimensional box has a ground-state

An electron confined to a one-dimensional box has a ground-state energy of 40.0 eV.
(a) If the electron makes a transition from its first excited state to the ground state, what is the wavelength of the emitted photon?
(b) If the box were somehow made twice as long, how would the photon's energy change for the same transition (first excited state to ground state)?

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