Atoms of silver vapor, each having a magnetic moment \(\mu_{B}\left(g=2, J=\frac{1}{2}ight)\), align themselves either parallel or antiparallel to the direction of an applied magnetic field. Determine the respective fractions of atoms aligned parallel and antiparallel to a field of flux density \(0.1 \mathrm{weber} / \mathrm{m}^{2}\) at a temperature of \(1,000 \mathrm{~K}\).