32. Electromagnetic Waves
The Electromagnetic Spectrum
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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