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Figure 3 shows part of an experimental set up for estimating the diameter of an oil molecule.
(i) Describe how the oil patch is formed.
(ii) In an experiment the diameter, a, of the patch was measured to be 200 mm for an oil drop of radius
0.25mm. Determine the diameter of the molecule of the oil. State why this is an estimate.
(iii) Describe one method of determining the diameter of the oil drop.
