Questions
Hard X-rays for the study of fractures in bones should have a minimum wavelength of m. The accelerating voltage for electrons in X-ray machine should be
a
>124 kv
b
<124 kV
c
between 60 kV and 70 kV
d
= 100 kv
detailed solution
Correct option is B
From conservation of energy the electron kinetic energy equals the maximum photon energy (we neglect the work function Φ because it is normally so small compared to eVo).eVo=hvmaxor eVo=hcλmin∴Vo=hceλmin orVo=12400×10−1010−11=124kVHence, accelerating voltage for electrons tn X-ray machine should be less than 124 kV.Talk to our academic expert!
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