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## Homework Statement

12-16 K + mesons can be photoproduced by the reaction γ + p → K

^{+}+ Λ where the initial proton is at rest in the lab. From the conservation laws, discover if it is possible for either the K

^{+}or the Λ to be at rest in the lab, and for what photon energy (in terms of the particle masses) this could happen.

## Homework Equations

E^2 = p^2c^2 + m^2c^4

p = mv

E = mc^2

## The Attempt at a Solution

I'm really stuck on this problem. It's probably more of an algebraic answer, because I believe I'm supposed to somehow get the two equations of energy and momentum conservation to have like terms and then combine them somehow, but I'm at a loss as to what to do. Any help is appreciated.