A mobile phone (cell phone) network sends and receives signals using microwaves with a frequency of $1.9 \times 10^{9}$ Hz. In air, microwaves travel at $3.0 \times 10^{8}\,\text{m s}^{-1}$.
(a)[2]
Calculate the wavelength in air of these microwaves.
(b)[2]
State two reasons for using microwaves for mobile phone (cell phone) signals.
(c(i))[3]
Describe, using a diagram, how a digital signal is different from an analogue signal.
(c(ii))[2]
State two advantages of digital signals instead of analogue signals.
Worked solution & mark scheme
This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The wavelength is 0.16 m” …