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In an accelerator experiment on high-energy collisions of electrons with positrons, a certain event is interpreted as annihilation of an electron-positron pair of total energy \( 10.2 \mathrm{eV} \) into two \( \gamma \)-rays of equal energy. What is the wavelength associated with each \( \gamma \)-ray?
(a) \( 2.436 \times 10^{-7} \mathrm{~m} \)
(b) \( 1.436 \times 10^{-7} \mathrm{~m} \)
(c) \( 2.436 \times 10^{+7} \mathrm{~m} \)
(d) \( 1.436 \times 10^{+7} \mathrm{~m} \)
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