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A positronium atom is a system consisting of a positron and an electron revolving about their common centre of mass which lies half way

A positronium atom is a system consisting of a positron and an electron revolving about their common centre of mass which lies half way between them. The ratio of velocity of electron in nth orbit of hydrogen atom to the velocity of electron in nth orbit of positronium. 01:1 01:2 2:1 4:1

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