A light beam of intensity 20 {W}/{c m^{2}} is incident normally on a perfectly reflecting surface of sides 25 {cm} \\times15 {cm}. The momentum imparted to the surface by the light per second is

Correct Answer is : 5×10−5kgms−1

1.2 \\times10^{-5} {kg} {ms}^{-1}

2 \\times10^{-5} {kg} {ms}^{-1}

1 \\times10^{-5} {kg} {ms}^{-1}

5 \\times10^{-5} {kg} {ms}^{-1}

KCET 2020 Physics Solved Paper

Question : 10 of 60

Marks: +1, -0

A light beam of intensity 20

cm2

is incident normally on a perfectly reflecting surface of sides 25cm×15cm. The momentum imparted to the surface by the light per second is

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