Photoelectric Effect
Rutgers U.

 

 

 

The white light was unable to discharge the electroscope  (eject the electrons) but the ultraviolet light could. Why???

 

 

 

 

The ultraviolet light had a higher frequency ....

 

... a higher energy.

 

 

 

 

Summary

 

 


1. Photoelectric Effect - Proved to us that light sometimes can act like a particle

 

 

2. What's the photoelectric effect?

 

- When you shine light on certain metals they give off photoelectrons

 

 

 

3. Changing the light in this experiment produced unexpected results

 

 

 

 

 

 

When you brighten light….

 

 

 

Get more
photoelectrons emitted

 

 

 

 

 

Increase frequency of light used…

 

 

 

 

Increase the energy of photoelectrons

 

 

 

 

 

 

4. Threshold Frequency-'DOORWAY '

 

Below Threshold f

 

 

No Emission

 

 

 

Above Threshold

 

 

 

Emission