12)A negatively-charged pion,whose mass is 273 times the mass of electrons moves in a circular orbit around a proton - Physics - Atoms

Question

12)A negatively-charged pion,whose mass is 273 times the mass of
electrons moves in a circular orbit around a proton it is a
pi-mesic hydrogen atom How many revolutions will the pion make
during its lifetime of 10^-8s in the ground state of the atom? ans
is 1 8×10^10

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12)A negatively-charged pion,whose mass is 273 times the mass of electrons moves in a circular orbit around a proton .it is a pi-mesic hydrogen atom.How many revolutions will the pion make during its lifetime of 10^-8s in the ground state of the atom? ans is 1.8×10^10