(a(i))[1]
light intensity.
(a(ii))[1]
the width of a crack in a welded joint.
(a(iii))[1]
the intensity of an ultrasound beam.
(b)
A student sets up the circuit in Fig. 9.1 to detect temperature changes over the range $0\,^{\circ}\text{C}$ to $100\,^{\circ}\text{C}$. The thermistor has resistance $R_T$ and the resistor has resistance $R$. The student observes the potential difference $V_{\text{OUT}}$. State and explain
(b(i))[3]
whether $V_{\text{OUT}}$ rises or falls as the thermistor becomes hotter.
(b(ii))[2]
whether the change in $V_{\text{OUT}}$ is linear with the change in the thermistor’s temperature.