In a pet scan an electron and positron annihilate each, Physics

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In a pet scan an electron and positron annihilate each

In a PET scan, an electron and positron annihilate each other, creating two (massless) photons. If the positron and electron were approximately at rest, the two photons must have equal energies (to conserve momentum). What is the kinetic energy of each photon in this case?

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Physics: In a pet scan an electron and positron annihilate each

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Physics: In a pet scan an electron and positron annihilate each

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