SOLUTIONS by Robert Lambert (Yr 13 student 1998-1999, now at Cambridge University)
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Below is the electromagnetic spectrum:
 


The Photon:
Q1 Above table was constructed using the equations
c = fl
and  E=hf

Q2 The second relationship was confirmed by the photoelectric experiment conducted by Millikan (using goldfoil and static electricity)
It also showed that light could be quantised (thought of in terms of photons not waves)

Q3 If      E2 = c2(p2+M2c2)  and  p= E/c
Then        E2 = c2[(E2/c2) +M2c2]
                0  =M2c4

So M must be equal to 0Kg.
Polarisation:
In unpolarised light there is an electric or magnetic field vector for the EM wave at all angles to any reference line that is made.
In polarised light, only electric vectors of a certain orientation (and magnetic vectors perpendicular to them) are present.

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