In developing Equation (3.36), we argued that the recoiling nucleus could be ignored. Co...

In developing Equation (3.36), we argued that the recoiling nucleus could be ignored. Consider again the x-ray tube described in Example 3.15 with 35-keV electrons striking a tungsten target. Suppose an electron is deflected through a negligible angle and its kinetic energy drops to 30 keV in a scattering event with a nucleus. Assuming that the nucleus was initially at rest, use conservation of momentum to find the kinetic energy of the recoiling nucleus and comment on the result.