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One Mev positron encounters one MeV elec...

One Mev positron encounters one MeV electron travelling in opposite direction. What is the wavelength of photons produced, given rest mass energy of electron or positron `=0.512MeV` ? Take `h=6.62xx10^(-34)J-s`.

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The correct Answer is:
`8.2 xx 10^(-13)`
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