Physics 9702 · AS & A Level · Errors and uncertainties
Errors and uncertainties — practice question
A microphone picks up a musical note with frequency $f$. It is linked to a cathode-ray oscilloscope (c.r.o.). The microphone signal is shown on the c.r.o. as illustrated in Fig. 2.1. The time-base setting of the c.r.o. is $0.50\,\text{ms cm}^{-1}$. The Y-plate setting is $2.5\,\text{mV cm}^{-1}$.
(a(i))[2]
Use Fig. 2.1 to find the signal amplitude.
(a(ii))[3]
Use Fig. 2.1 to find the frequency $f$.
(a(iii))[2]
Use Fig. 2.1 to find the actual uncertainty in $f$ due to reading the scale on the c.r.o.
(b)[1]
State $f$ along with its actual uncertainty.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “amplitude scale indication $= 2.2\,\text{cm}$” …