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The positron is a fundamental particle with the same mass as that of the electron and with a charge equal to that of an electron but of opposite sign. When a positron and an electron collide, they may annihilate
\( \mathrm{P} \) each other. The energy corresponding to their mass appears in two photons of equal energy. Find the

W wavelength of the radiation emitted.
[ Take : mass of electron \( =\left(0.5 / \mathrm{C}^{2}\right) \mathrm{MeV} \) and \( \mathrm{hC}=1.24 \times 10^{-12} \mathrm{MeV} \).m where \( \mathrm{h} \) is the Plank's constant and \( \mathrm{C} \) is the velocity of light in air]
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