Question

Hard X-rays for the study of fractures in bones should have a minimum wavelength of . The accelerating voltage for electrons in X-ray machine should be:

A

B

C

Between and

D

Medium

Solution

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Correct option is A)

From conservation of energy the electron kinetic energy equals the maximum photon energy (we neglect the work function  because it is normally so small compared to 



(Plank's Constant) = , (Speed of light) = ,
  (Charge of electron) =


Hence, accelerating voltage for electrons in X-ray machine should be less than .

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