PHYS 1750: SELECTED TOPICS in PHYSICS
LECTURE 36. Electromagnetic Waves

23.1.	Maxwell's Equations Without Charges
	1.	∑ ΔA*E⊥ = 0; sum over surface elements of a volume
	2.	∑ ΔA*B⊥ = 0; sum over surface elements of a volume
	3.	∑ Δl*E|| = − ΔΦB / Δt; sum over line elements of a loop
	4.	∑ Δl*B|| = μoεo ΔΦE / Δt: sum over line elements of a loop
23.1.	Wave Solution
	1.	Changing E creates/destroys B
	2.	Changing B creates/destroys E
23.2.	Waves from an Antenna
	1.	Changing electric dipole produces E
	2.	Alternating current produces B
23.1-2.	Properties of EM Waves
	1.	Speed of light c =1/sqrt[ μoεo] = 2.99792×108 m/s
	2.	E/B = c
	3.	Transverse wave: polarization
23.3-4.	The Spectrum of EM Waves
	1.	Wavelength and frequency
	2.	Intensity (energy content) proportional to amplitude squared
		Power/area = Emax2/ 2μoc
	3.	Radio, microwave, infrared, visible, ultraviolet, X-ray, γ-ray

Review Questions
Lecture 37: Geometric Optics

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