Summary

• Band theory of solids
• Semiconductors

• Class quiz
  
  
• Semiconductor devices
  • p-n junctions
  • diodes
  • transistors
  • light emitting diodes
  • photovoltaics
  • integrated circuits
  • Moore's Law
    Example #1
    
  
  
  
  
  
  
  
  
• The nucleus
  • protons
  • neutrons
  • isotopes
  • line of stability applet
    Example #2
    
  
  
  

gc6 29.tb11
In its lowest quantum state, a diatomic quantum mechanical rotator has a rotational energy of
A. zero           B.           C.           D.
Answer







gc6 29.23
What bandgap do you need to produce an LED that emits at λ = 515 nm?
A. 2.41 eV               B. 1.91 eV
C. 1.24 eV               D. 5.15 eV
Answer







gc6 30.q2
What isotope is represented by the X in ?
A. xenon-82                B. lead-38
C. strontium-38           D. strontium-82
Answer







 



A. zero
The lowest rotational energy level corresponds to L = 0.












 



A. 2.41 eV













 



D. strontium-82
The number at the lower left is the atomic number Z and identifies the isotope as strontium. The number at the upper left is the atomic number A and it tells you the number of nucleons is 82.












Moore's Law