This question allows you to demonstrate your ability to carry out calculations such as those introduced in Block 3 Parts 1 and 2 and theUsing Numbers (maths) booklet.

In each case you should demonstrate how you worked out your answer, as well as giving the answer. Youmustshow your working to gain full marks. In each case about half of the marks awarded are for a clear explanation of your working.

a.A sinewave has a frequency of 600 Hz (cycles/sec). What is theperiodof this sinewave expressed in scientific notation to three significant figures? Remember, the period of a sinewave is the time in seconds it takes for one cycle.

If this period value is now halved, what will be the resulting frequency of the sinewave? Again, give your answer in scientific notation, this time to two significant figures.

(8 marks)

b.Convert the following dotted decimal IP address into binary.

192.80.45.178

Identify in your answer which specifically is thenetwork partand which is thehost partof this IP address.

(8 marks)

c.In an optical fibre, the power drops by a factor of 10 approximately every 30 km. If the power sent by the transmitter is 0.1 W, how far will a signal be transmitted before the power is attenuated to 100 W?

Include a table showing the signal power vs. distance in 30 km intervals as part of your answer (similar to Table 1.2 in Section 1.4.4).

(6 marks)

d.Express the following 48-bit binary MAC address in hexadecimal.

01101110 11000100 00111001 11110010 01011010 10111101

(8 marks)