Is it the same as all the other atoms? About 10^-9.....this is a legitimate question on my assignment...
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An anti-hydrogen atom will have an anti-proton with a single positron orbiting it. Its radius will be the same as a normal hydrogen atom, which is about half an angstrom or 0.5 x 10^-10 metres.
The volume will be much less than the 1E-9 you quote (I'm not sure what units you are using). It can be approximated as a sphere with a radius of half an angstrom, which gives a volume of 4/3 x pi x r^3 = 5 x 10^-31 m^3.
The volume will be much less than the 1E-9 you quote (I'm not sure what units you are using). It can be approximated as a sphere with a radius of half an angstrom, which gives a volume of 4/3 x pi x r^3 = 5 x 10^-31 m^3.