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
BITSAT

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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