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A positronium atom is a system consists of a positron and an electron. The wavelength of the first Balmer line for positronium is (in

A positronium atom is a system consists of a positron and an electron. The wavelength of the first Balmer line for positronium is (in the units of ) (answer should be an integer). (Given: Wavelength of the first Balmer line for hydrogen is 6563 ).

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