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[" 13.Positronium consists of an electro...

[" 13.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)/2," (b) "R_(oo)/4," (c) "2R_(oo)," (d) "R_(oo)]]

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