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Paul Sheffield

on 26 September 2013

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Transcript of Photons

What is a photon
Energy of photons
Photons per second

Key points
Emitted when a fast moving electron is stopped, slows or changes direction
electron move to a lower energy shell of an atom
Emitted in bursts "packets" called photons
Einstein 1905:
explain photoelectricty
Photon energy
Photon Energy = hf

Energy of a photon depends on the frequency

Plank Constant: HELP!!! http://www.colorado.edu/physics/2000/quantumzone/photoelectric2.html
Laser power
The Power of the beam = nhf

n=number of photons in a beam passing a certain point
each photon has the energy hf

Do questions 1-4
Electromagnetic waves
All EM waves travel at the speed of light.
wave equation
c = speed of light
electric wave and a magnetic wave at right angles
in phase of step
Particles and Anti particles
what is antimatter
what happens when a particle and antiparticle meet?
Are Ant-atoms possible?
read pages 10-12
Make notes on antimatter
PET scanner
Dirac's theories
rest energy
Pair production
Full transcript