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A system of positron (+1^(e^(0))) and el...

A system of positron `(+1^(e^(0)))` and electron `(–1^(e^(0)))` is called Positronium atom. The radii of Positronium atom is expanded but energy levels are reduced by a factor of x compared to H – atom.
(a) Find x
(b) Is it true to say that the entire spectrum of Positronium will be shifted towards longer wavelength compared to H – atom.

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