Physics 9702 · AS & A Level · Errors and uncertainties

Errors and uncertainties — practice question

A micrometer is used to measure the $28.50\,\text{mm}$ width of a plastic ruler. The micrometer gives a reading to the nearest $0.01\,\text{mm}$. How should this measurement be recorded correctly?

  • A$0.02850 \pm 0.01\,\text{m}$
  • B$0.0285 \pm 0.001\,\text{m}$
  • C$(2.850 \pm 0.001) \times 10^{-2}\,\text{m}$
  • D$(2.850 \pm 0.001) \times 10^{-3}\,\text{m}$

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