Electrons of mass m with de-Brogile wavelength fall on the target in an X-ray tube. The cut off wavelength of the emitted X-ray is
(a) Key idea Cut-off wavelength occurs when incoming electron looses its complete energy in collision. This energy appears in the form of X-rays.
Given, mass of electrons=m
So, kinet energy, of electron =
Now, maximum energy of photon can be given by