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Unexpected
Results

 

 

What does it mean when we say that light has a dual nature?

 

 

 

Unexpected Results!:

 

 

As long as you are
above a certain frequency ...

1. When you brighten the light source

 

 

Get more electron emission

 

 

 




Rate of
Photoelectron
emission
  Intensity of light (Brightness)

 

 

 

 

... but

 

not faster

 

(more energetic) electrons!!!!

K.E. of
Photoelectrons
  Intensity of light (Brightness)

 

 

 

 

 

Results Contradict

Wave Theory!

 

 

 

According to
 Wave Theory…

 

 

 Increasing Brightness,
Increases Energy of wave

 

 

 

Should Increase Kinetic Energy
 of Electrons Emitted

 

- It Didn't!!

 

 

 

 K.E. photoelectron

 

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