Question 13 A photoelectron is emitted from K shell (n = 1) of an atom with the atomic number Z = 17, and an election in

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Question 13
A photoelectron is emitted from K shell (n = 1) of
an atom with the atomic number Z = 17, and an
election in M shell (n = 3) moves down to the vacancy
in the K shell. What is the energy, in the unit of eV, of the
photon emitted during this transition?
Use for the energy difference
between two states in the atom,
where E0 = 13.6 eV.
Use σ = 1 for the transition
to K shell and σ = 7.4 for
the transition to Lshell.