Assume that the mass of an electron is 511 keV/c^2. The mass of an antielectron,

Question

Assume that the mass of an electron is 511 keV/c^2. The mass of an antielectron, or positron, is identical. (The charge of the positron is equal in magnitude, but opposite in sign, to the charge of the elctron.) An electron and a positron can form a bound state called positronium. Positronium is quite similar to a hydrogen atom, except that in positronium, the electron and positron orbit around each other, while in hydrogen, the elctron orbits the proton. The ionization energy of positornium is 6.8 eV. What is the mass, in units of keV/c^2, of positronium?

Explanation / Answer

Sorry, made a mistake, not quite that simple, its: 2 * 511 keV/c^2 - 6.8 eV = 1021993.2 eV/c^2

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