Question

What will be the energy of one photon of radiation whose frequency is $5\times {10}^{14}Hz$?

• A. $199.51J$
• B. $3.3\times {10}^{-19}J$
• C. $6.626\times {10}^{-34}J$
• D. $2.31\times {10}^{5}J$

Answer 1

The correct option is B $3.3\times {10}^{-19}J$

The energy of one photon is given by the expression, $E=h\nu$

where, $h=6.626\times {10}^{-34}Js$ and $\nu =5\times {10}^{14}{s}^{-1}$

$E=6.626\times {10}^{-34}\times 5\times {10}^{14}=3.313\times {10}^{-19}J$

Hence, option $B$ is correct.