Question 1 (30 marks) a. A sinewave has a period (duration of one cycle) of 620 us. What is the corresponding frequency of this sinewave in kHz, expressed to three significant

figures (see Study note 7.1 in the Using numbers (maths) booklet)? If the frequency of the sinewave is now reduced by a factor of 2.75, what will be the new period value? Express your answer in ms to three significant figures. Note: in the second part of this question, to avoid rounding errors in your calculations, use the full frequency value from the first part, not the value rounded to three significant figures. (10 marks) b. In a specific, high-quality coaxial cable, it was found that the power drops by a factor of 10 approximately every 0.85 km. If the original signal power is 0.125 W (1.25 x 10- ¹ W), how far will a signal be transmitted before the power is attenuated to 1.25 µW? C. Include a table showing the signal power (in W) versus distance in 0.85 km intervals (similar to Table 1.2 in Section 1.4.4) as part of your answer. If optical fibre is used instead of the coaxial cable, briefly explain how you would expect the above calculated distance value to change (see Section 1.4.4). You are not required to include another table, or a new calculation, for this last part. (10 marks) Express the following 48-bit binary MAC address in hexadecimal (see the Using numbers (maths) booklet). 001001001100110110111001 - 111000001000100110101101 (10 marks)