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For the positronium atom formed by a positron and an electron, taking into account the wavelength...

For the positronium atom formed by a positron and an electron, taking into account the wavelength of the photon published in the transition between n. and m. orbits in Bohr theory, calculate the Rydberg constant and the wavelength (in m and Å) corresponding to the Halpha line, which is the first line of the Balmer series,

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