Question

An electromagnetic radiation has an energy 14.4 eV. To which region of electromagnetic spectrum does it belong?

• A. Ultraviolet region
• B. Visible region
• C. X-ray region
• D. Y-ray region

Answer 1

The correct option is C X-ray region

$E=\frac{hc}{\lambda }$

$\lambda =\frac{hc}{E}=\frac{6.626\times {10}^{-34}\times 3\times {10}^8}{14.4\times 1.6\times {10}^{-19}}=0.86\times {10}^{-09}$

Cosmic Rays ${10}^{-14}mto{10}^{-12}m$

$\gamma$ Rays ${10}^{-12}mto{10}^{-10}m$

$x$ Rays ${10}^{-10}mto{10}^{-09}m$

Ultraviolet Rays ${10}^{-7}mto4\times {10}^{-7}m$

Hence, it lies in $x$ Rays region.