An electromagnetic wave with pointing vector 5 `W//m^(2)`is absorbed by a surface of same area. If the force on the surface is `10^(-7)`N, then area isA. `6m^(2)`B. `3m^(2)`C. `60m^(2)`D. `4m^(2)`

An electromagnetic wave with pointing vector 5 `W//m^(2)`is absorbed b

1.	An electromagnetic wave with pointing vector 5 `W//m^(2)`is absorbed by a surface of same area. If the force on the surface is `10^(-7)`N, then area isA. `6m^(2)`B. `3m^(2)`C. `60m^(2)`D. `4m^(2)`
Answer» (a) We know `,P=(I)/(c)=(5)/(3xx10^(8))` and `F=PxxA implies A=(F)/(P)` `A=(10^(-7))/(5)xx3 xx10^(8)implies A=6 m^(2)`

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An electromagnetic wave with pointing vector 5 `W//m^(2)`is absorbed by a surface of same area. If the force on the surface is `10^(-7)`N, then area isA. `6m^(2)`B. `3m^(2)`C. `60m^(2)`D. `4m^(2)`

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