An electron in an infinite one-dimensional potential well jumps from the n = 4 energy level to the ground state energy level and in doing so emits a photon of wave-length 20.9 nm. What is the width of the well? Assume electron mass = 9.11e − 31 kg, ℎ = 6.626e − 34 J. s and c = 3e8 m/s.
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