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Gravitational Field

The pressure ...

Question

The pressure exerted by an electromagnetic wave of intensity I(W/m2) on a non-reflecting surface is (c is velocity of light)

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Solution

Dear Student,

$P r e s u u r e e x e r t e d b y e l e c t r o m a g n e t i c r a d i a t i o n i s d u e t o c h a n g e i n m o m e n t u m w h e n i t h i t s a s u r f a c e - F o r E M W m o m e n t u m i s g i v e n b y p = \frac{I A}{c} H e r e, I = i n t e n s i t y, A = A r e a, c = s p e e d o f l i g h t . F o r a n o n r e f l e c t i n g s u f a c e c h a n g e i n m o m e n t u m p e r s e c o n d w i l l b e ∆ p = \frac{I A}{c} S o, P r e s s u r e = \frac{F}{A} = \frac{I}{c} N / m^{2}$
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