Physics · May / June 2023 · Paper 41 · Question 6
0625
As printed in the paper
The question as text
A mobile phone (cell phone) network uses microwaves of frequency 1.9 × 109 Hz to transmit and receive signals. The speed of microwaves in air is 3.0 × 108 m / s.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
6(a)[2]
(wavelength =) 0.16 m
v = fλ OR (λ =) v / f OR (λ =) 3 × 108 / 1.9 × 109
6(b)[2]
(microwaves) only need short aerials / antennas
(microwaves) penetrate (some) walls
6(c)(i)[3]
labelled diagram of digital (signal) with blocks of high (1) and low (0) AND labelled diagram of analogue with continuously variable signal
digital (signal) consists of two values owtte
analogue (signal) varies over a range (of values) owtte
6(c)(ii)[2]
any two from:
faster (data) transmission rate OR data can be compresseddata / signal transmitted over long(er) distances (as signal can be regenerated)noise easily removed (from signal / data) OR signal can be regenerated
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