Hard `X` -rays for the study of fractures in bones should have a minimum wavelength of `10^(-11) m`. The accelerating voltage for electrons in `X` -ray machine should be

Options

A. `lt 124.2 kV`
B. `gt 124.2 kV`
C. Between 60 kV and 70 kV
D. equal to 100 kVs

Answer

A

Explanation

`V_("max")=(12400xx10^(-10))/(10^(-11))=124 kVrArrVlt124 kV`