# Wave - Particle Duality j

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```					Wave - Particle Duality
Evidence ;

Wave Model      Particle Model
Diffraction    Photoelectric Effect
Interference   Spectrometry
Polarisation
Refraction
Reflection

Duality

z ALL physical entities may be described as
either WAVES or PARTICLES       (Duality)
z Linked by two equations ;
E = hf
p = h/l              (De Broglie equation)
E, p - particle phenomena
f, l - wave phenomena
as predicted by Einstein
Special Theory of Relativity,
h = Planck constant = 6.6 x 10-34 Js
Some more Maths

z consider a photon ;
p = h/l,      E = hf,        c = fl
p = h/l = hf/c = E/c
=> E = pc
but, p = mc       (momentum = mass x velocity)

=> E = mc2
What does it mean ?

z When a photon is considered as a
particle, its mass may be taken as
equal to ;
z m = E/c2 = hf/c2
z this ‘mass/energy equivalence’ is
only significant in nuclear physics.

```
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 views: 2 posted: 3/19/2014 language: English pages: 7