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Suppose an electron is trapped in a quantum well of 5 nm wide with walls that are high enough for the infinite well to be

Suppose an electron is trapped in a quantum well of 5 nm wide with walls that are high enough for the infinite well to be a good approximation. The electron makes a transition down to its ground state from the next-lowest state by emitting a photon. Determine (a) the energy and (b) the wavelength of a photon

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