An X-rays tube produces a continuous spectrum of radiation with its short wavelength end at 0.45 Å. What is the maximum energy of a photon in the radiation? What is the order of accelerating voltage (for electrons) required in such a tube? 



Correct option is

27.6 keV, 30 keV



The maximum energy of the X-ray photon is  






                    = 27.6 keV. 

For getting X-ray photons of 27.6 keV energy, the electrons striking the target in the X-ray tube must possess kinetic energy of at least 27.6 keV. Therefore, accelerating voltage of order of 30 keV is required in the tube for accelerating electrons.   



The binding energy of the innermost electron in tungsten is 40 keV. To produce characteristics X-rays using a tungsten target in an X-ray tube, the accelerating voltage should be greater than 


X-rays of wavelength  are incident normally on a crystal and the second order reflection on diffraction from the crystal observed at an angle of 45o. The lattice constant of the crystal is 


The frequency of  line of a source of atomic number Z is proportional to


A direct X-ray photograph of the intestines is not generally taken by the radiologists because :


X-rays which can penetrate through longer distance in substances are called.


The target in an X-rays tube should be a:


The maximum frequency of the X-rays produced in an X-ray tube


Which one of the following parameters of the emitted X-rays increases when the potential difference between the electrodes of an X-ray tube is increased?  


Calculate the energy of a photon, in electron-volt (eV) and in watt-hour (W h), of wavelength 6600 Å. 



In an accelerator experiment on high-energy collisions of the electrons with positrons, a certain event is interpreted as the annihilation of an electron-positron pair of total energy 10.2 BeV into two -rays of equal energy. Find the wavelength associated with each -ray.