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a)Define analog and digital signals. Give examples of analog and digital communication systems, respectively. b)What type of medium is used for transmitting a WiFi signal? Determine the frequency of the following signals: \text { (i) } \quad v=2 \sin (2 \pi x 4 t) \text { (ii) } \quad v=3 \cos (2 \pi \times 2.5 t) \text { (iii) } \quad v=0.5 \sin (2 \pi \times 2 t) Sketch the time domain response of the following signal: \text { (i) } \quad v=2 \sin (2 \pi \times 0.5 \mathrm{t}) \text { (ii) } \quad v=5 \cos (2 \pi \times 3 t) \text { (iii) } \quad v=1.5 \cos (2 \pi \times 2 t) Sketch the frequency domain response of the following signals and indicate the bandwidth on your sketch: \text { (i) } \quad v=2 \sin (2 \pi \times 4 t) \text { (ii) } \quad v=3 \sin (2 \pi \times 1 t)+4 \sin (2 \pi \times 3 t)

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