Emission of Visible light

Some electrons with energies in the conduction band will lose all their energy and make a transition to the valence band. These electrons emit the light that we see coming from the detecting material. Use the results of your work with the IR Detection program to determine:

1. how much energy did electrons in the card lose as they made the transition from the excited state band to the ground state band? Explain how you determined this energy.
   
2. what is the energy and color of light emitted by the IR detector card?
   
3. how is the energy band model that is used to explain the IR detection process consistent wit the law of conservation of energy?