Atomic StructureHard
Question
Hard X-rays for the study of fractures in bones should have a minimum wavelength of 1011 m. The accelerating voltage for electrons in X-ray machine should be
Options
A.<124.2kV
B.>124.2kV
C.Between 60 kV and 70kV
D.= 100 kV
Solution
= ev ⇒ v = 
=
× 104 = 12.375 × 104 124 × 103V = 124 kV
For minimum wavrlength energy is 124 kV
∴ The accelerating voltage should be < 124kV
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