Question

The energy of an X-ray photon of wavelength $1\, ?$ is $\left( h =6.6 \times 10^{34} J - s \right)$

• A. 24.6 keV
• B. 6.1 keV
• C. 12.3 keV
• D. 1.2 keV

Answer 1

Answer: (C)

12.3 keV

Answer 2

The energy of X-ray photon, $E=\frac{h c}{\lambda}=\frac{6.6 \times 10^{-34} \times 3 \times 10^{8}}{1 \times 10^{-10}}$ $J=\frac{1.98 \times 10^{-15}}{1.6 \times 10^{-19}}$ $=12.3\, keV$