Learn Extracted exam questions A-Level Physics 9702 Physics November 2025 Question Paper 54
9702 Physics November 2025 Question Paper 54
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Fig. 1.1 shows a horizontal turntable.
Point C is at the centre of the turntable. Point P is a distance $r$ from the centre.
Fig. 1.2 shows a side view of a d.c. motor attached to the turntable with a belt.
The motor is used to rotate the turntable at frequency $f_0$. The motor is switched off and the turntable continues to rotate at frequency $f_0$.
A sphere of adhesive putty of mass $m$ is dropped onto the turntable at point P. The frequency of the turntable is now $f$.
It is suggested that $f$ is related to $m$ by the relationship
where $\beta$ and $K$ are constants.
Plan a laboratory experiment to test the relationship between $f$ and $m$.
Draw a diagram showing the arrangement of your equipment.
Explain how the results could be used to determine values for $\beta$ and $K$.
In your plan you should include:
\begin{itemize} \item the procedure to be followed \item the measurements to be taken \item the control of variables \item the analysis of the data \item any safety precautions to be taken. \end{itemize}
A student places a slide with a double slit on a support clamped to the bench as shown in Fig. 2.1.
The distance between the slide and the screen is $D$.
The separation $s$ of the slits is determined.
Light from a laser is incident normally on the double slit. An interference pattern is observed on the screen. The distance $w$ across 10 fringes is measured. The distance $y$ between the centres of adjacent fringes is calculated using the equation
The experiment is repeated with slides of different slit separation $s$.
It is suggested that $y$ and $s$ are related by the equation
A graph is plotted of $y$ on the $y$-axis against $\frac{1}{s}$ on the $x$-axis.
Determine an expression for the gradient.
gradient = \hrulefill
Values of $s$ and $w$ are given in Table 2.1.
\begin{center} \textbf{Table 2.1} \newline \begin{tabular}{|c|c|c|c|} \hline $s / \text{mm}$ & $\frac{1}{s} / \text{mm}^{-1}$ & $w / \text{mm}$ & $y / \text{mm}$ \ \hline $0.18 \pm 0.01$ & & $33.0$ & \ \hline $0.21 \pm 0.01$ & & $28.9$ & \ \hline $0.24 \pm 0.01$ & & $25.1$ & \ \hline $0.27 \pm 0.01$ & & $22.6$ & \ \hline $0.31 \pm 0.01$ & & $19.6$ & \ \hline $0.38 \pm 0.01$ & & $15.9$ & \ \hline \end{tabular} \end{center}
Calculate and record values of $\frac{1}{s} / \text{mm}^{-1}$ and $y / \text{mm}$ in Table 2.1. Include the absolute uncertainties in $\frac{1}{s}$.
Plot a graph of $y / \text{mm}$ against $\frac{1}{s} / \text{mm}^{-1}$. Include error bars for $\frac{1}{s}$.
Draw the straight line of best fit and a worst acceptable straight line on your graph. Label both lines.
Determine the gradient of the line of best fit. Include the absolute uncertainty in your answer.
gradient = \hrulefill
The distance between the slide and the screen is measured several times:
Determine the mean distance $D$. Include the absolute uncertainty.
$D = \hrulefill \text{ m}$
Using your answers to \textbf{(a)}, \textbf{(c)(iii)} and \textbf{(d)}, determine the value of $\lambda$. Include an appropriate unit.
$\lambda = \hrulefill$
Determine the percentage uncertainty in $\lambda$.
percentage uncertainty in $\lambda = \hrulefill \%$
The experiment is repeated. Determine the slit separation $s$ that gives a value of $y$ of $(0.500 \pm 0.005) \text{ cm}$. Include the absolute uncertainty.
$s = \hrulefill \text{ m}$