APHY201 10/24/2015 1 22.1 Maxwell’s Equations   1865 – James Maxwell unifies electricity and magnetism and shows that their fields move through space.

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Presentation transcript:

APHY201 10/24/ Maxwell’s Equations   1865 – James Maxwell unifies electricity and magnetism and shows that their fields move through space as waves.   He calculated that the EM waves travel at the speed of light so they must be a type of light.   1887 – Heinrich Hertz generates and detect EM waves for the first time

APHY201 10/24/ Production of Electromagnetic Waves   Energy is stored in E and B   Magnitude of E and B are   At large distances, the waves are planar or flat.

APHY201 10/24/ Production of Electromagnetic Waves   EM waves are transverse EM waves Amplitude is perpendicular to wave motion   EM waves travel at c = E/B = 3 x 10 8 m/s

APHY201 10/24/ Light and the Electromagnetic Spectrum   Speed = Frequency * Wavelength c = f λ

APHY201 10/24/ Light and the Electromagnetic Spectrum 5 X-ray Visible PolarizedRadio

APHY201 10/24/ Momentum Transfer and Radiation Pressure   Remember that   Maxwell showed that where a = 1 to 2   Since and then

APHY201 10/24/ Momentum Transfer and Radiation Pressure

APHY201 10/24/ Wireless Transmission   Radio and wireless telegraph (1890’s)   The FCC and broadcast “bands”

APHY201 10/24/ Wireless Transmission

APHY201 10/24/ Wireless Transmission

APHY201 10/24/ Wireless Transmission