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h.a.y.l.e.y

- 8

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I was hoping someone could please help me with the following question:

A moving neutral pion is observed to decay into 2 photons each with energy 80MeV, there being an angle 120deg between their trajectories.Calc

i)The total energy of the meson

ii)The momentum of the meson

iii)The rest mass of the meson

I am aware one must use the realtivistic formula for energy etc, but it is the business of the angle that confuses me.

Thanks for your time...