The maximum electric field strength in air is . Stronger electric fields ionize the air and create a spark. What is the maximum power that can be delivered by a -diameter laser beam propagating through air
Maximum power is .
Electric field is.
a. Show that and , the energy densities of the electric and magnetic fields, are equal to each other in an electromagnetic wave. In other words, show that the wave’s energy is divided equally between the electric field and the magnetic field.
b. What is the total energy density in an electromagnetic wave of intensity ?
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