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Positronium consists of an electron and ...

Positronium consists of an electron and a positron (a particle which has the same mass as an electron , but opposite charge ) orbiting round their common centre of mass. Calculate the value of the Rydberg constant for this system

A

`R_oo //4`

B

`R_oo //2`

C

`2R_oo`

D

`R_oo`

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The correct Answer is:
B
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