CAIE IGCSE Physics Digital and Analogue Signals

Practise distinguishing digital signals with two discrete states from analogue signals that vary continuously across a range, using labelled traces.

Exam points

describe a digital signal as two discrete states, commonly high/low or 1/0
describe an analogue signal as continuously variable across a range of values
draw and label a stepped two-level digital trace beside a smoothly varying analogue trace

[Maximum number: 3]

A mobile phone (cell phone) network uses microwaves of frequency $1.9 \times 10^{9} \mathrm{~Hz}$ to transmit and receive signals.

The speed of microwaves in air is $3.0 \times 10^{8} \mathrm{~m} / \mathrm{s}$ .

All mobile phone (cell phone) networks use digital signals to communicate with the phone.

Describe, with the aid of a diagram, how a digital signal differs from an analogue signal.

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3.3.8—Difference between a digital and question 1