Electromagnetic Waves

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Presentation transcript:

Electromagnetic Waves

Fields are perpendicular to each other and perpendicular to propagation of wave (transverse)

Full Spectrum

Waves c2 = 1/(εo μo) How far is one Light year? v = f λ v = c = 3 x108 m/s c2 = 1/(εo μo) How far is one Light year?

Energy Density Electric energy density = ½ εo E2 Magnetic energy density = 1/(2 μo) *B2 Total energy density μ = ½ εo E2 + 1/(2 μo) *B2

Intensity S = Power/Area (W/m2) S = ½ c εo E2 + c/(2 μo) *B2

Doppler Effect fo = fs (1 +/- vrel/c ) vrel << ct + toward, - away An airport radar emits a signal with a frequency of 8 x109 Hz, what frequency does an inbound airplane travelling at 200m/s observe? What frequency does the radar station observe returning from the airplane?