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## Homework Statement

The results of particle collisions are observed using particle detectors. Sometimes the products of these collisions are themselves unstable and decay to give further particles; the products of decay can be photons.

In one collision, a stationary [itex]\pi^\circ[/itex] meson is produced which then decays to give two gamma ray photons. The rest mass of the meson is [itex]135 \ MeV/c^2[/itex].

[itex]\pi ^\circ \rightarrow \beta + \beta[/itex]

Calculate the wavelength of each photon.

## Homework Equations

[itex]E = hf = \frac{hc}{\lambda}[/itex]

## The Attempt at a Solution

How can I find [itex]E[/itex]? I can carry on from that point but I don't know which equation to use to find [itex]E[/itex]?

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