Question

Energy of a quanta of frequency ${10}^{15}Hz$ and $h=6.6\times {10}^{-34}J-sec$ will be

• A. $6.6\times {10}^{-19}J$
• B. $6.6\times {10}^{-12}J$
• C. $6.6\times {10}^{-49}J$
• D. $6.6\times {10}^{-41}J$

Answer 1

The correct option is A

$6.6\times {10}^{-19}J$

$E=hv=6.6\times {10}^{-34}\times {10}^{15}=6.6\times {10}^{-19}J$