Answer the questions given below about the historical development of SI base units.
PHYSICS · Multi-part · A Level · Physics · Measurements and their errors · Measurements and their errors
Problem
Answer the questions given below about the historical development of SI base units.
(i) Describe briefly how the metre and the kilogram were originally defined in terms of physical artefacts.
(ii) Give any two reasons, for each of the above units, that led scientists to abandon artefact-based definitions.
(iii) Explain how defining the metre and the second in terms of fundamental constants of nature improves reproducibility of measurements in laboratories across the world.