In vacuum an electromagnetic wave has speed c 29979 times, Ask an Expert

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In vacuum, an electromagnetic wave has speed c = 2.9979 × 10⁸m/s and frequency f = 6.0 × 10¹⁴ Hertz. It enters a material whose index of refraction is n = 1.40.

(a) Obtain the speed of the wave in the material.

(b) Obtain the frequency of the wave in the material.

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