A student determines the internal diameter $$\(d\)$$ of a test-tube. The apparatus is assembled as shown in Fig. 1.1. Fig. 1.1 The internal diameter $$\(d\)$$ of a cylinder is given by the equation $$\(d=k \sqrt{G}\)$$, where $$\(k=1.13 \mathrm{~cm}\)$$. Calculate $$\(d\)$$ for the test-tube. $$\[ d=\ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots . . . . \ldots . . . . . . . . . . . . . . . . . . . . \text { cm [1] } \]$$ (ii) Suggest one reason why your calculated value for $$\(d\)$$ is only approximate. .

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