S10P1CLec21A

# S10P1CLec21A - Physics 1C Lecture 21A "Shake this one, that...

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Physics 1C Lecture 21A "Shake this one, that one shakes later. The sun atom shakes; my eye electron shakes eight minutes later because of a direct interaction across." --Richard Feynman

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EM Waves A “special” type of wave is the electromagnetic wave. Accelerated charges produce electromagnetic waves. In EM waves, the electric and magnetic Felds are perpendicular to each other. Both Felds are also perpendicular to the direction of motion. This makes EM waves transverse waves.
EM Waves Electromagnetic waves travel at the speed of light. We conclude that light is an electromagnetic wave. EM waves carry energy as they travel through space. where ε o = 8.85x10 –12 C 2 /(Nm 2 ) and μ o = 1.26x10 -6 (Tm/A).

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EM Waves The average power per unit area of the EM wave is given by: When light waves strike a surface of area, A in a time interval, Δ t, the intensity, I, of the light will yield a certain amount of energy, U. Energy carried by EM waves is shared equally by the electric and magnetic Felds.
EM Waves Electromagnetic waves transport linear momentum as well as energy. Even if the waves are reFected from a surface,

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## This note was uploaded on 06/03/2010 for the course PHYS PHYS 1C taught by Professor F during the Spring '00 term at UCSD.

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S10P1CLec21A - Physics 1C Lecture 21A "Shake this one, that...

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