1.

Electromagnetic radiation of intensity I is made incident normally on a perfect nonreflecting surface (i.e perfect absorber). Then pressure developed on this surface would be …… .

Answer»

IC
`Ic^(2)`
`(I)/(C )`
`(I)/(c^(2))`

Solution :Pressure developed on a given surface,
`P_(S)=(F)/(A)=(((p)/(t)))/(A)=(p)/(At)=(((U)/(C )))/(At)=(U)/(ACt)=(I)/(C )`
(where p = MOMENTUM, U = radiant ENERGY I = INTENSITY of radiation `= (U)/(At)`)


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