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Figure 10 shows an arrangement used to investigate the inverse-square law forgamma radiation. The count rate is measured for a range of distances d between the source and theGeiger Müller (GM) tube.

A background count is determined at the start and at the end of the investigation.Explain why, When d = 9.0 cm the measured count rate is 84.49 s¹ and the corrected countrate CR is 84.16 s¹. Deduce the background count measured over a time period of 5 minutes. \text { shows values of } d, C_{\mathrm{R}} \text { and } \frac{1}{\sqrt{C_{\mathrm{R}}}}

\text { is a plot of } \frac{1}{\sqrt{C_{\mathrm{R}}}} \text { against } d \text {. }

Plot on Figure 11 the last three points from your completed Table 2. Draw on Figure 11 the line of best fit. Discuss whether your graph supports the inverse-square law.

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