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A Li2+ ion undergoes a transition from the n = 4 to the n = 3...

  1. A Li2+ ion undergoes a transition from the n = 4 to the n = 3 state. What is the energy of the emitted photon?
  2. What is the ground state configuration of chlorine (Z = 17)?
  1. The energy gap for a semiconductor is 1.25 eV. Of the frequencies given below, what is the minimum frequency photon than can move an electron from the valence band to the conduction band?
  2. An LED emits light of wavelength 600 nm. What is its band gap?

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