PHYSICS · Multi-part · A Level · Physics · Measurements and their errors · Measurements and their errors
Problem
A balance shows the mass of a chemical sample as 2.4350g. This mass is to be used in further calculations.
(i) Round the mass to four significant figures.
(ii) Round the same mass to three significant figures.
(iii) Give a short justification for the digits retained in parts (i) and (ii), paying special attention to the treatment of the trailing zero in the original reading.
(iv) The sample occupies a volume of 0.46cm3 (two significant figures). Calculate the density of the substance in g cm−3 and express the final answer to the correct number of significant figures.