\( A \pi^{\circ} \) meson at rest decays into two photons of equal ...

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\( A \pi^{\circ} \) meson at rest decays into two photons of equal energy. If the wavelength (in \( \mathrm{m} \) ) of the photons is
\( 1.8 \times 10^{-n} \) then find \( n / 2 \) (The mass of the \( \pi^{0} \) is \( 135 \mathrm{MeV} / \mathrm{c}^{2} \) )
\( \mathrm{P} \)
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