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Unicorn.
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Homework Statement
Hello everybody ,
a/There's an elastic collision between a photon of energy E and an electron at rest. After the collision, the energy of the photon is E/2 and propagates in a direction making an angle theta=60° with the initial direction. Find E. What kind of photon is this ?
Homework Equations
The Attempt at a Solution
I really have difficulties with this problem, for example in question a/ How can I find the energy if i don't have the velocity of the electron ..?
a/c=1
Conservation of energy gives:
E+mo=E/2+gamma*mo
E(1-1/2)=mo(gamma-1)
If I use conservation of momentum I have :
h/λ=h/λ'cosθ+mv
But then ?Thank you !
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