Physics first-term paper 2

14.1 Analogue and Digital signals – Student Work Book.

1). (a) Explain what is meant by the Binary number system.

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(b) Explain why the binary number system is very important for digital electronic systems.

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2). The table below contains both decimal and binary numbers. Complete the table by giving the equivalent binary or decimal number. The first row is completed for you as an example.

Decimal Number
Binary Number
(a)
8
01000
(b)
4

(c)

10100
(d)

00110
(e)
15

(f)
28

(g)

11001
(h)
19

For more examples go to www.ikes.freeserve.co.uk/homework/hwk.htm

3). (a) On the axes below, draw an example of an analogue signal.

(b) State two examples of sources of analogue signals.

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4). (a) On the axes below, draw an example of a digital signal.

(b) State two examples of sources of digital signals.

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5). (a) Show, by calculation, that if the tape speed of a C90 Compact Cassette was 47.6 mms-1 then there would be approximately 130m of tape in the cassette.

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(b) When all of the tape is spooled onto the one reel, its outer radius is 26mm and its inner radius is 12mm. Estimate, by calculation, the thickness of the tape.

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6). (a) Explain two advantages of storing information digitally.

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(b) Explain one disadvantage of storing information digitally.