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Which of the following would change the intensity of a sinusoidal electromagnetic wave with frequency f,...

Which of the following would change the intensity of a sinusoidal electromagnetic wave with frequency f, wavelength λ, electric field amplitude Emax, and propagation speed v through a material with index of refraction n = 1.5 (assume negligible absorption)?

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change Emax

change λ

change f

change v by passing into a material with n = 1.2 (again, assume negligible absorption)

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