Question

An electromagnetic radiation has an energy $14.4keV$ To which region of the electromagnetic spectrum it belongs ?

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

Answer 1

Answer: (D)

Given radiation has $14.4keV$ energy, so it is within the energy range for X-rays which is between $100eV$ to $100keV$.
The wavelength of given radiation,
$\lambda =\frac{hc}{E}$ joule $=\frac{6.64\times 10^{-34}\times 3\times 10^8}{14.4\times 10^3\times 1.6\times 10^{-19}}$ volt
$=0.86\mathring{A}$
X- rays have wavelength range between $0.1\mathring{A}$ to $1\mathring{A}$.