![]() Upon simplification, the intensity (I) is found to be approximately 1.33 × 10 -3 W/m 2. According to statistical mechanics, the equilibrium probability distribution over the energy. In the following we will calculate the internal energy of the box at absolute temperature T. ![]() This vacuum energy of the electromagnetic field is responsible for the Casimir effect. For r 0 the energy of the mode is not zero. We can calculate the intensity (I) using the formula: 1) The number r can be interpreted as the number of photons in the mode. Let’s assume we have an electromagnetic wave with an electric field strength (E) of 50 V/m. Therefore, you only need one of these values to calculate the intensity of an electromagnetic wave. It is important to note that the electric and magnetic field strengths are related by the equation B = E/c.
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