Dual Nature Of Radiation

When 0.25\(\mathop A\limits^o\) X-Rays strike a material, the photoelectrons from the \(K\) shell are observed to more in a circle of radius \(23 \mathrm{~mm}\) in magnetic field of \(4 \times 10^{-2}\) tesla active perpendicularly to the direction of emission of photoelectrons. What is the Binding energy of \(K\) shell electrons?