Question

The frequence of a photon having energy $100$eV is?(Take $h=6.2\times {10}^{-34}Js;1eV=1.6\times 10-19J$).

• A. $2.417\times {10}^{-16}$Hz
• B. $2.417\times {10}^{16}$Hz
• C. $2.417\times {10}^{17}$Hz
• D. $10.54\times {10}^{17}$Hz

Answer 1

The correct option is B $2.417\times {10}^{16}$Hz

Given E$=100$eV$=100\times 1.6\times {10}^{-19}$J
and $h=6.662\times {10}^{-34}$Js

$E=hv$

$v=\frac{E}{h}=\frac{100\times 1.6\times {10}^{-19}}{6.662\times {10}^{-34}}$

$=0.24\times {10}^{17}$

$=2.417\times {10}^{16}$Hz.