Unexpected Results lesson illustration

 

 

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

 

 

 

Unexpected Unexpected Results lesson illustrationResults!:

 

 

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

1. When you brighten the light source

 

Unexpected Results lesson illustration 

Get more electron emission

 

 

Unexpected Results lesson illustration

Unexpected Results lesson illustration

Unexpected Results lesson illustration

Unexpected Results lesson illustration

 




Rate of
Photoelectron
emission
Unexpected Results lesson illustration
  Intensity of light (Brightness)

 

 

 

 

... but

 

not faster

 

(more energetic) electrons!!!!

K.E. of
Photoelectrons
Unexpected Results lesson illustration
  Intensity of light (Brightness)

 

 

 

 

 

Results Contradict

Unexpected Results lesson illustration

Wave Theory!

 

 

 

According to
 Wave Theory…

 

 

 Increasing Brightness,
Increases Energy of wave

 

Unexpected Results lesson illustration

Unexpected Results lesson illustration

 

 

Should Increase Kinetic Energy
 of Electrons Emitted

 

Unexpected Results lesson illustration

- It Didn't!!

 

 

 

 Unexpected Results lesson illustrationK.E. photoelectron Unexpected Results lesson illustration