7. A student has submitted the solution to a problem. The problem is: A noisy channel accepts frequencies between 0 MHz and 100 MHz and has a signal to noise ratio of 32. What is the channel capacity? The student's solution is: Capacity = 2 * BW * log2L =2 * 100 * log, (32) =200*5 1000 Mbps What is the error in this solution? 8. Answer the following questions concerning modulation and keying: 8.1 What characteristic of the carrier wave is changed to represent the data in PSK? a. amplitude b. frequency c. phased. period a. FM 8.2 What kind of keying or modulation changes only the amplitude of a carrier wave to represent data? b. ASK c. PSK d. QAM 8.3 Frequency modulation (FM) and frequency shift keying (FSK) are two names for the same thing. a true b. false 8.4 Which converts digital data to an analog signal? a. analog modulation b. keying c. pulse code modulation d. line coding What kind of modulation or keying is shown below? All three graphs together describe one modulation or keying method: the top graph is the carrier wave, the middle graph is the data, and the bottom graph is the output signal