Photoelectric Effect Applets

• Photoelectric Effect Lab 1
  
  • Conduct the three experiments at the bottom of the page.
  • For several different wavelengths, record wavelength and stopping voltage. To find the stopping voltage, first set the voltage high enough to see current at the top. Then, step the voltage down in the smallest possible increments until the current drops to zero. That is the stopping voltage.
  • Repeat method above for other materials.
  • Plot frequency (c/λ) versus KE_max (e·V_stop).
  • What is the slope of the line? What is the intercept?
  • Repeat the plot with a different material. Compare the results.
  • Use Excel to help with your graphs.
• Photoelectric Effect Lab 2
  Describe the pieces of this experimental apparatus.