Photoelectric Effect

1
Photoelectric Effect

• Shine light on a metal and eject electrons

Light
Electron
A
-
V

2
Results
Photocurrent
I2gtI1
Kmax
Metal 1
I2
Metal 2
I1
0
-Vs
f0
Applied Voltage
f
3
Requirements

• Light must be above a minimum frequency
• Threshold frequency depends on the metal
• Electrons are immediate
• Current depends on intensity not frequency
• Max KE depends on frequency not intensity

4
Conclusion

• Light is composed of grains of energy
• Kmax hf - ? where ? is the work function
• f0 ?/h
• IT WORKS!!!