Q5 of 59 Page 395

The X-ray coming from a Coolidge tube has a cutoff wavelength of 80 pm. Find the kinetic energy of the electrons hitting the target.

Given:


Cutoff wavelength of the Coolidge tube,


λ=80pm
Energy of the electron hitting the target


E is given by



Here,


h=Planck’s constant
c = Speed of light


λ= Wavelength of light


∴


⇒


≈15.5 keV


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Find the cutoff wavelength for the continuous X-rays coming from an X-ray tube operating at 30 kV.

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What potential difference should be applied across an X-ray tube to get X-ray of wavelength not less than 0.10 nm? What is the maximum energy of a photon of this X-ray in joule?

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If the operating potential in an X-ray tube is increased by 1%, by what percentage does the cut-off wavelength decrease?

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