4) Show that irradiance, Ee, has the same units as energy density times velocity. It turns out that for EM waves, these quantities are in fact equivalent. Using this fact, find the energy density of a radio wave 480 km from a 50,000 W source, assuming the waves are traveling in vacuum and the propagation is the same in all directions (i.e. it is isotropic).
4) Show that irradiance, Ee, has the same units as energy density times velocity. It turns out that for EM waves, these quantities are in fact equivalent. Using this fact, find the energy density of a radio wave 480 km from a 50,000 W source, assuming the waves are traveling in vacuum and the propagation is the same in all directions (i.e. it is isotropic).
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Transcribed Image Text:4) Show that irradiance, Ec, has the same units as energy density times velocity. It
turns out that for EM waves, these quantities are in fact equivalent. Using this
fact, find the energy density of a radio wave 480 km from a 50,000 W source,
assuming the waves are traveling in vacuum and the propagation is the same in all
directions (i.e. it is isotropic).
Expert Solution
Step 1
irradiance is the radiant flux received by a surface per unit area.
Irradiance is the radiometry term for the power per unit area of electromagnetic radiation incident on a surface. The SI unit for irradiance is watts per square meter [W/m2], or milliwatts per square millimeter [mW/mm2].
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