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sir my ques. is In annihilation concept of chp. electrostatics why e- + e+ -> 2gamma ray photon,
The question is not fully clear. If your question is Why TWO gamma rays, I would recommend to go through the following link Click Here for More information
Further, I request you to post detailed questions and doubts here.
Thank you
Find the value 0f 50J/Min on a sytem which has 100g, 100cm and 1 min as fundamental units