Kcet
Electromagnetic Waves
KCET 2020
MCQ+1 / -02020
A light beam of intensity \(20 \mathrm{~W} / \mathrm{cm}^2\) is incident normally on a perfectly reflecting surface of sides \(25 \mathrm{~cm} \times 15 \mathrm{~cm}\). The momentum imparted to the surface by the light per second is