Problem 6.162

A spectral line caused by the transition ${ }^{3} D_{1} \rightarrow{ }^{3} P_{0}$ experiences the Zeeman splitting in a weak magnetic field. When observed at right angles to the magnetic field direction, the interval between the neighbouring components of the split line is $\Delta \omega=1.32 \cdot 10^{10} \mathrm{~s}^{-1}$ Find the magnetic field induction $B$ at the point where the source is located.