(Answered) Positronium consists of an electron and a positron same

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Positronium consists of an electron and a positron (same mass as electron, but opposite charge)orbiting around their common center of mass. The broad features of the spectrum are thereforeexpected to resemble those of hydrogen, the differences arising largely from the mass relations. At which energy will the first three lines of the Balmer series of positronium appear?

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