Physics 9702/53 — October/November 2017

Cambridge A-Level · Planning, Analysis and Evaluation · worked solutions for every part, with the mark scheme

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Topics Analysis, Conclusions and Evaluation · Planning

Q115MPlanningAnalysis, Conclusions and EvaluationFree sample

A student is investigating the resistance of a light-dependent resistor (LDR) separated from a source of light by different depths of water as shown in Fig. 1.1.

Fig. 1.1

It is suggested that the relationship between the resistance $R$ of the LDR and the depth $d$ of the LDR in the water is

R = \frac{4\pi d^2}{K}

where $K$ is a constant.

Design a laboratory experiment to test the relationship between $R$ and $d$ . Explain how your results could be used to determine a value for $K$ . You should draw a diagram, on page 3, showing the arrangement of your equipment. In your account you should pay particular attention to

• the procedure to be followed,
• the measurements to be taken,
• the control of variables,
• the analysis of the data,
• any safety precautions to be taken.

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