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An e.m. wave with poynting vector 6watt/...

An e.m. wave with poynting vector `6watt//m^2` is absorbed by a surface of area `12m^2`. Find the force on the surface.

Text Solution

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Force F exerted by e.m. wave on an absorbing surface of area A is given by,
`F=PA, But P=I//c`
So, `F=(IA)/c=(6xx12)/(3xx10^8)=24xx10^-8N`
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