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Relativistic Energy

Heinsbergrelatz
in Quantum Theory

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How do you solve questions like this? I really need help cause i cant get the hang of it:

A neutral pion of mass 135MeV/c^2 traveling at 0.8c decays in to two photons traveling in opposite direction. What is the ratio of the frequency of photon A to that of photon B???

 

 

You can solve the problem in any frame of reference you wish, so you choose a convenient one. Then transform into the frame given in the problem.

 

The rest frame is a convenient one, because momentum is zero. That puts certain easily-applied constraints on the problem.

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