Question

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

• A. < 124 kV
• B.

  124 kV

• C. between 60 kV and 70 kV
• D. #ERROR!

Answer 1

Answer: (A)

< 124 kV

Answer 2

Using, $V = \frac{hc}{e \lambda_{min}}$
$= \frac{12400 \times 10^{-10}}{10^{-11}} = 124 \, kV$
Acceleration voltage for electrons in X-ray machine should be less than 124 kV.