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Answer:
c.
Explanation:
Electromagnetic waves are waves that are generated when an electric field and a magnetic field vibrate together. They are usually created whenever an electric field collides with a magnetic field.
In more generic terms for an electric field, the energy per unit volume is given by:
Energy density = [tex]\dfrac{1}{2}\varepsilon _oE^2[/tex]
For magnetic field:
Energy density =[tex]\dfrac{\beta^2}{2 \mu _o}[/tex]
∴
For the electromagnetic wave (u):
Total energy density is:
[tex]u = \dfrac{1}{2}\varepsilon_oE^2 + \dfrac{\beta ^2}{2 \mu_o}[/tex]
Due to the fact that the energy related with both fields is equivalent:
Then:
E = cB