Find the minimum energy that a `gamma`-ray must have to give rise to an electron -positron pair. `{:("Mass of electron",= 0.00055 am u,),("Mass of pos
Find the minimum energy that a `gamma`-ray must have to give rise to an electron -positron pair.
`{:("Mass of electron",= 0.00055 am u,),("Mass of positron",= 0.00055 am u,):}`
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