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II. Explaining photoelectric effect using quantum theory

 

 

A. Quantum Theory

 

1) electrons can only absorb or emit energy in discrete amounts called quanta (packets)

 

 

2) Energy of each quanta (photon) is proportional to frequency of radiation

 

 

Energy of a Quanta

 

 

E = hf

 

 

 

June 2004 #40

 


Max Planck

h = Planck's constant 

=6.63 X 10-34 Js

 

 

 

Since: c = fλ

c = 3 x 108 m/s

 

And f = c/λ

 


E = hc/λ


 

 

 


Einstein,
Photoelectric Effect

 

 

 

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