An X-ray tube operates at 40 kV. Suppose the electron converts 70% of its energy into a photon at each collision. Find the lowest three wavelengths emitted from the tube. Neglect the energy imparted to the atom with which the electron collides.


Given:


Potential of the X-ray tube V= 40kv


energy of the X-ray =


Energy utilized by the electron is given by



Wavelength of the X-ray is given by





for the second wavelength


E=30%



Therefore,





For the third wavelength,





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