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Positronium is just like a H-atom with t...

Positronium is just like a H-atom with the proton replaced by the positively charged anti-particle of the electron (called the positron which is as massive as the electron). What would be the ground state energy of positronium ?

A

`-136eV`

B

`-6.8eV`

C

`-3.4eV`

D

`-1.51eV`

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The correct Answer is:
B
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