1.

A 1 MeV positron and a 1 MeV electron meet, each moving in opposite directions. They annihilate each other by emitting two photons. If the rest mass energy of an electron is 0.51 MeV, then the wavelength of each photon is

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A 1 MeV positron and a 1 MeV electron meet, each moving in opposite directions. They annihilate each other by emitting two photons. If the rest mass energy of an electron is 0.51 MeV, then the wavelength of each photon is



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