Electrons with energy 80 keV are incident on the tungsten t…

Physics Electron, Photon, Photoelectric Effect and X-rays Hard MCQ (Single Correct)

Electrons with energy 80 keV are incident on the tungsten target of an X -ray tube. K shell electrons of tungsten have ionization energy 72.5 keV. X-rays emitted by the tube contain only

A continuous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of

A continuous X-ray spectrum (Bremsstrahlung] with all wavelengths

The characteristic X-rays spectrum of tungsten

A continuous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of

and the characteristic X-ray spectrum of tungsten

Text Solution

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The correct answer is:

Minimum wavelength of continuous -ray spectrum is given by (in )

Here, energy of incident electrons (in eV)
energy corresponding to minimum wavelength of X -ray

Also the energy of the incident electrons is more than the ionization energy of the -shell electrons (i.e. 72.5 keV). Therefore, characteristic X-ray spectrum will also be obtained because energy of incident electron is high enough to knock out the electron from or -shells.