Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • NCERT
  • Show that the radiation pressure exerted by an EM wave of intensity I on a surface kept in vacuum is frac{I}{c}.

Show that the radiation pressure exerted by an EM wave of intensity I on a surface kept in vacuum is \frac{I}{c}.

Answers (1)

Energy received by the surface per second, E = IA

No.of photons received per second by the surface

=N=\frac{E}{E_{photon}}=\frac{E\lambda }{hc}=\frac{IA\lambda }{hc}

For a perfectly absorbing surface, is

\Delta P=\frac{h}{\lambda }

Force

, F=N.\Delta P=\left ( \frac{IA\lambda }{hc} \right )\left ( \frac{h}{\lambda } \right )=\left ( \frac{IA}{c} \right )

Pressure,

P=\frac{F}{A}=\frac{I}{c}

Posted by

infoexpert23

View full answer

Similar Questions

Latest Question