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Photons and wave-particle duality in light
By Cameron Bell
Photons
What are photonsPhotons are the discrete particles
which light are made out of
They travel at the constant speed of 2.9979 X 108 m/s
They have no mass
They can collide with each other
Mass of a photonPhotons have no mass
But they are always moving
In a vacuum they move at the speed of light
Discovery of the photonIn 1905 Albert Einstein published a
paper in which he proposed that light was made of particles called photons
In 1909 and 1916 he reinforced his statement on photons
In 1921 he was awarded the Nobel prize mostly for the theory of relativity but also partially for the discovery of photons
Facts about photonsIn water photons travel around 25% slower
than when they are in a vacuum
Cherenkov radiation produces a glow and is caused by particles travelling faster that the light around them
Photons are do not point in the direction that they are travelling but point perpendicular to it
The photon torpedo in star trek is a missile that has a small quantity of matter and antimatter separated in a magnetic container and touch upon impact
Wave Particle duality
What is the wave particle dualityThe wave particle duality is the
phenomenon where in one instance something can behave as a particle and in another instance (without any progression between the two) can behave like a wave
Some example of particles that behave like this are electrons and photons
The double slit experimentThomas young was the first to perform
the double slit experiment
The experiment shows that if you shoot electrons or photons at something with only one slit in it then it will behave like a particle
But if you shoot it at something with more than one slit then it will behave like a wave
What is the difference between how a wave and particle act
When a particle is fired at two slits then it will create two lines behind the slits
But if a wave is directed to the two slits then it will create an interference pattern
A video explaining the double slit experimenthttp://www.youtube.com/watch?v
=DfPeprQ7oGc
The End
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