A plane electromagnetic wave, has frequency of 2.0 … 10¹⁰ Hz and its energy density is 1.02 … 10^–8 J/m³ in vacuum. The amplitude of the magnetic field of the wave is close to ( … and speed of light = 3 … 10⁸ ms^–1)

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Electromagnetic Waves

JEE Main 2020 · 2 Sep, Morning shift · Q6765

PhysicsMedium120×since 2002Q6765

A plane electromagnetic wave, has frequency of 2.0

\times

10¹⁰ Hz and its energy density is 1.02

\times

10^–8 J/m³ in vacuum. The amplitude of the magnetic field of the wave is close to (

{1 \over {4\pi {\varepsilon _0}}} = 9 \times {10^9}{{N{m^2}} \over {{C^2}}}

and speed of light = 3

\times

10⁸ ms^–1)