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9.) When an electron and a positron, each with 400 keV of kinetic energy, collide and annihilate head on to create two photons, what will

9.) When an electron and a positron, each with 400 keV of kinetic energy, collide and annihilate head on to create two photons, what will be the wavelength of each of the photons.

Use conservation of energy and remember that for a photon p = E/c.

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