Physics 9702 · AS & A Level · Characteristics of alternating currents
Characteristics of alternating currents — practice question
Within a mobile phone system, the region covered by the system is broken up into several cells. For this system, Explain why
(a(i))[1]
adjacent cells are given different carrier frequencies.
(a(ii))[1]
each cell covers only a limited area, even in sparsely populated regions.
(b)[3]
A mobile phone handset is left switched on. Explain why, even though no call is being made, the computer at the cellular exchange is still working for this phone.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “interference is avoided close to cell boundaries” …