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Consider a particle and its anti-particle, both of mass m =9.1×10−31 kg, which collide with negligible...

Consider a particle and its anti-particle, both of mass m =9.1×10−31 kg, which collide with negligible kinetic energy with each other and annihilate to produce two photons of equal energy. Calculate the energy E in keV and the wavelength λ in pm (pico-meters) of one photon

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