# What is the intensity of an electromagnetic radiation?

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1. Sep 23, 2015

### ecastro

How can I compute the intensity of an electromagnetic radiation if I know $e_x, e_y, e_z, h_x, h_y,$ and $h_z$, where $e_i$ is the electric field component at $i$ and $h_i$ is the magnetic field component, also at $i$?

2. Sep 23, 2015

### Staff: Mentor

3. Sep 24, 2015

### ecastro

The intensity here is the amount of radiation received by a detector. Is it the same as the radiation per unit area per unit time?

4. Sep 24, 2015

### Staff: Mentor

If you want the amount of energy received by a detector that has a certain area, during a certain amount of time, then you multiply the Poynting flux (as given on that page) by the area and the time.