The signal x(t) =1+3cos + sin V is passed through an RC low-pass filter shown below, where R-12 and C= 1F. R (a) What is the input power spectral density, P(f)? (b) What is the output power spectral density, P, (f)? x(1) (c) What is the average normalized output power. P? C Fig.4.

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Fiber Optics

Fiber optics is a technology used to transmit the facts such as light or pulses with fiber or plastic over long distances. Visual fibers are about the width of a human hair strand and, when tied directly to a fiber-optic cable, can transmit multiple long-distance records and faster in different ways.