# Consider a hydrogen atom in a n=4 state. The (total) energy of an electron in this state is En= eV. Then this atom emits a photon and assumes a n=3 state. The (total) energy of an electron in this state is En= eV. Find the wavelength of the emitted photon 2= nm. Now, find the corresponding wavelength if this is an ion of an element with atomic number Z=17 containing a single electron (the charge is (Z-1)+). Az= nm.

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### Physics of Atoms

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Consider a hydrogen atom in a n=4 state. The (total) energy of an electron in this state is En= eV. Then this atom emits a photon and assumes a n=3 state. The (total) energy of an electron in this state is En= eV. Find the wavelength of the emitted photon 2= nm. Now, find the corresponding wavelength if this is an ion of an element with atomic number Z=17 containing a single electron (the charge is (Z-1)+). Az= nm.