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## Main Question or Discussion Point

Is the intensity of a general electromagnetic wave always the norm of its Poyinting vector?

Or are there other notions of intensity?

Or are there other notions of intensity?

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- Thread starter kent davidge
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- #1

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Is the intensity of a general electromagnetic wave always the norm of its Poyinting vector?

Or are there other notions of intensity?

Or are there other notions of intensity?

- #2

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https://de.wikipedia.org/wiki/Intensität_(Physik)

Note that the energy flux for an em. field (in vacuo) is given by the Poynting vector

$$\vec{I}=\vec{S}=\frac{1}{\mu_0} \vec{E} \times \vec{B}.$$

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