Q. A laser beam of pulse power $10^{12}$ W is focused on an object of area$10^{- 4}\ cm^{2}$. the energy flux in $Wcm^{2}$ at the point of focus is
A) $10^{20}$
B) $10^{16}$
C) $10^{8}$
D) $10^{4}$
Explanation
(b) Electric flux $\phi = \frac{pulse\ power}{area}$
$= \frac{10^{12}}{10^{- 4}} = 10^{16}\ Wcm^{- 1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.