32. Electromagnetic Waves
The Electromagnetic Spectrum
4:47 minutes
Problem 31.69
Textbook Question
Textbook QuestionIn free space (“vacuum”), where the net charge and current flow is zero, the speed of an EM wave is given by v = 1 √ε₀μ₀. If, instead, an EM wave travels in a nonconducting (“dielectric”) material with dielectric constant K, then v = 1 √Kε₀μ₀. For frequencies corresponding to the visible spectrum (near 5 x 10¹⁴ Hz), the dielectric constant of water is 1.77. Predict the speed of light in water and compare this value (as a percentage) with the speed of light in a vacuum.
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