A Levels Physics

A metre rule is used to measure the length of a piece of wire. It is found to be 70 cm long to the
nearest millimetre.
How should this result be recorded in a table of results?
A 0.7 m
B 0.70 m
C 0.700 m
0.7000m


Choice C is correct because:

The measurement is given to the nearest millimeter. A millimeter is three decimal places in meters; 1 mm = 0.001 m

Hence, the length should be recorded with three decimal places to maintain the same level of precision. 

This means it should be stored as 0.700m.

Choices A, B, and D are incorrect because they state the wrong way of recording the results in the table.

Physical Quantities and Units | 2010 - O/N - 9702/12 | Q4