Question

An electromagnetic radiation has an energy of 13.2keV. Then the radiation belongs to the regions of

• A. Visible light
• B. Ultraviolet
• C. Infrared
• D. X-ray

Answer 1

Answer: (D)

X-ray

Answer 2

: Given: $E = 13.2keV$

$\lambda(in\overset{o}{A}) = \frac{hc}{E(ineV)} = \frac{12400}{13.2 \times 10^{3}} = 0.939\overset{o}{A} \approx 1\overset{o}{A}$

X –rays cover wavelengths ranging from about $10^{- 8}$m (10 nm) to $10^{- 13}m(10^{- 4}nm)$

An electromagnetic radiation of energy $13.2$ keV belongs to X –ray region of electromagnetic spectrum.