The ratio of average electric energy density and total average energy density of electromagnetic wave is:
The ratio of average electric energy density and total average energy density of electromagnetic wave is:
- [JEE MAIN 2023]
- A
$2$
- B
$1$
- C
$3$
- D
$\frac{1}{2}$
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A $27\, mW$ lager beam has a cross -sectional area of $10\, mm^2$. The magnitude of the maximum electric field in this electromagnetic wave is given by:........$kV/m$ [Given permittivity of space ${ \in _0} = 9 \times {10^{ - 12}}\, SI\, units$, speed of light $c = 3 \times 10^8\, m/s$]
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- [JEE MAIN 2019]
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- [JEE MAIN 2021]
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- [NEET 2020]
Aplane electromagnetic wave is incident on a plane surface of area A normally, and is perfectly reflected. If energy $E$ strikes the surface in time $t$ then average pressure exerted on the surface is ( $c=$ speed of light)
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