The pressure exerted by an electromagnetic wave of intensity `I (Wm^(-2))` on a non-reflecting surface is ( c is the velocity of light)
The pressure exerted by an electromagnetic wave of intensity `I (Wm^(-2))` on a non-reflecting surface is ( c is the velocity of light)
A. `Ic`
B. `Ic^(2)`
C. `I//c`
D. `I//c^(2)`
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Correct Answer - C
When a surface intercepts electromagenetic radiation, a force and a pressure are exerted on the surface. As the surface is non-reflecting , so it is completely abosorbed and in such case the force is
`F = (IA)/(c)`
The radiation pressure is the force per unit area,
`P = (F)/(A) = (I)/(c)`
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