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Show that the radiation pressure exerted by an EM wave of intensity I on a surface kept in vacuum is `I//c`. |
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Answer» Pressure `=("Force")/("Area") =(F)/(A)` Force is the rate of change of momentum `"i.e., "" "F=(dp)/(dt)` `"Energy in time dt"" " U=p.C " or " p =U/c` `:. " ""Pressure" = 1/A .(U)/(C.dt)` `" prssure" =I/C " "[":." I = "Intensity" =(u)/(A.dt)]` |
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