# Question

If the proton is unstable, GUT theory predicts that its primary mode of decay is into a beta particle and a pion.

(a) Write down the only decay possible.

(b) If the pro-ton is initially free and at rest, determine the total kinetic energy and relative direction of the emitted particles.

(a) Write down the only decay possible.

(b) If the pro-ton is initially free and at rest, determine the total kinetic energy and relative direction of the emitted particles.

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