Q. For light of wavelength 5000 $\mathring{\mathrm{A}},$ photon energy is nearly 2.5 eV. For $X$-rays of wavelength 1$\ \mathring{\mathrm{A}}$, the photon energy will be close to
A) $\lbrack 2.5 \div 5000\rbrack eV$
B) $\lbrack 2.5 \div (5000)^{2}\rbrack eV$
C) $\lbrack 2.5 \times 5000\rbrack eV$
D) $\lbrack 2.5 \times (5000)^{2}\rbrack eV$
Explanation
(c) As energy $\propto \frac{1}{\lambda}$,
Therefore, energy corresponding to $1\ \mathring{\mathrm{A}} = 2.5 \times 5000\ eV$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.