Continuous X-ray MCQ - Practice Questions with Answers

Continuous X-ray-

As we know about the phenomenon of visible light, similarly continuous X-ray spectra also contains photons ranging through a lot of wavelengths. From the previous concept, we know that the production of X-rays happens when the target which is made up of an element with a high atomic number is hit by electrons travelling at a high velocity. So out of the total energy, most of the energy applied is wasted by being converted into heat energy in the target material’s system. X-rays that have continuously unstable wavelengths are produced due to the loss of energy that the few electrons who were moving fast enough (and penetrated to the interior sections of the atoms of the material being targeted) suffer. Since the attractive pulling forces applied by the nucleus of the target element causes a deceleration of these fast-moving electrons, this makes the decrease in the energy of the electron continuously. Due to this, varying frequency of X-rays is emitted continuously due to the retardation of the speed of electrons. The X – rays consist of a continuous range of frequencies up to a maximum frequency _maxor minimum wavelength _min. This is called continuous X – rays. The minimum wavelength depends on the anode voltage. If V is the potential difference between the anode and the cathode, then - 

To produce the continous X-ray in the Coolidge tube, an electron is projected toward the anode with an accelerating voltage V. So, the kinetic energy of the projectile electron will be eV. As shown in the figure, it experiences strong electric force toward the nucleus of the atom and due to this strong attraction the velocity of this electron, when it emerge from the atom, will be highly reduced and negligible compared with the initial speed of the projectile electron.

According to the law of conservation of energy, the energy of these electromagnetic radiations will be equal to the decrease in the kinetic energy of the projectile electron.

But the velocity of the coming electron will be less as compare to the projectile electron. This difference of kinetic energy will cause the production X-rays.