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A positromium atom is a bound system of an electron (e^ – ) and its antiparticle positron (e ^+ )revolving about their centre of mass.

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A positromium atom is a bound system of an electron (e – ) and its antiparticle positron (e + )revolving about their centre of mass. Find the wavelength of the radiation when the system de-excites from its first excited state to the ground state.

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This problem can be solved by Bohr’s theory of the hydrogen atom by replacing the mass of the electron by its reduced mass.

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