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Physics (AS & A Level) · May / June 2018 · Paper 12 · Question 1

9702Physical quantities

A sheet of gold leaf has a thickness of 0.125 µm. A gold atom has a radius of 174 pm. Approximately how many layers of atoms are there in the sheet?

  1. A4
  2. B7
  3. C400
  4. D700

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Correct answer: C. 400

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