At some place in universe an atom consists of a positron revolving round an antiproton. The ratio of the wavelength of the corresponding spectral lines from this atom and ordinary hydrogen atoms is:

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The wavelength of spectral lines is related to the reduced mass of the system. For the positron-antiproton system, the reduced mass is approximately half the mass of the electron (or positron).

For the hydrogen atom, the reduced mass is approximately the mass of the electron. Since wavelength is inversely proportional to the reduced mass, the ratio of wavelengths is approximately 1.

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