Q. In an $X$-ray tube electrons bombarding the target produce $X$-rays of minimum wavelength $1\ \mathring{\mathrm{A}}.$ What must be the energy of bombarding electrons
A) $13375\ eV$
B) $12375\ eV$
C) $14375\ eV$
D) $15375\ eV$
Explanation
(b) $E(eV) = \frac{hc}{e\lambda} = \frac{6.6 \times 10^{- 34} \times 3 \times 10^{8}}{1.6 \times 10^{- 19} \times 1 \times 10^{- 10}} = 12375\ eV$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.