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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 Bev into two `gamma-`rays of equal energy. What is the wavelength associated with each `gamma-`ray? `("1Bev = "10^(9) eV)`

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Use `lambda=(hc//E)" with " E=5.1xx1.602xx10^(-10)J" to get "lambda=2.43xx10^(-16)m`.
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