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LoginLet E_(0) and B_(0) denote the amplitude of electric and magnetic filed of a plane electromagnetic wave in air. The magnitude of the average momentum transferred per unit area and per unit time to a totally abosorbing surface is
Class 12 Physics in Class 12 3 years ago
`1/2 epsi _(0) E_(0) ^(2)`
`1/2 mu_(0) B_(0)`
`epsi _(0) E_(0) ^(2)`
`(B_(0) ^(2))/(mu_(0))`
`I = 1/2 epsi _(0) E_(0) ^(2)c =(1 B_(0) ^(2) c)/(mu_(0))`
where `E_(0)=` electric field and c = speed of LIGHT. Now, momentum transfer per unit area per unit time, which is also called radiation PRESSURE.
`I/A ((Deltap )/(DELTA t)) = I /c = ((1)/(2)epsi _(0) E_(0)^(2)c)/(c )`
`I /c =1/2 epsi _(0) E_(0)^(2)`
[where, `Deltap,=` momentum transferred, `DELTAT=` time and A = area.]
Posted on 11 Dec 2021, this text provides information on Class 12 related to Physics in Class 12. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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