Questions
A 1 MeV positron and a 1 MeV electron meet each other moving in opposite directions. They annihilate each other by emitting two photons. If the rest mass energy of an electron and positron is 0.51 MeV, then the wavelength of each photon is
detailed solution
Correct option is C
Total energy before annihilation 1+1+2x0.51=3.02 MeV energy of each photon 1.51 MeVwavelength λ=124001.51×106=8.2×10-3A0Talk to our academic expert!
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The half life period of a radioactive element X is same as the mean life time of another radioactive element Y. Initially both of them have the same number of atoms. Then
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