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# Consider a Bohr model of doubly ionized lithium. (a) Write an expression similar to Equation 28.14 for the energy levels of the sole remaining electron. (b) Find the energy corresponding to $n=4 .$ (c) Find the energy corresponding to $n=2 .$ (d) Calculate the energy of the photonemitted when the electron transits from the fourth energy level to the second energy level. Express the answer both in electron volts and in joules. (e) Find the frequency and wavelength of the emitted photon. (f) In what part of the spectrum is the emitted light?

## a) $E_{n}=\frac{-122 \mathrm{eV}}{n^{2}}$b) $-7.63 \mathrm{cV}$c) $-30.5 \mathrm{cV}$d) $3.67 \times 10^{-18} J$ or $22.95 \, \rm eV$e) $\lambda = 54 \rm nm$, $f = 5.52 \times 10^{15} \mathrm{Hz}$f) ultraviolet

Atomic Physics

Nuclear Physics

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