Question

The wavelength of a photon in Angstrom units having energy of one electron volt is :

• A. $2.42\times {10}^3\stackrel{o}{A}$
• B. $3.42\times {10}^3\stackrel{o}{A}$
• C. $2.42\times {10}^4\stackrel{o}{A}$
• D. none of these

Answer 1

The correct option is D none of these

Energy of photon is given by,

$E=h\times \nu$

$\nu =\frac{c}{\lambda }$, $E=1eV=1.602\times {10}^{-19}J$

$1.602\times {10}^{-19}J$=$6.63\times {10}^{-34}$ $\frac{3\times {10}^8}{\lambda }$

$\lambda =1.24\times {10}^{-8}m$