Physics

Problem

A stopwatch reading is written by two students as

9.40\,\text{s}

and

9.4\,\text{s}

. Which statement correctly compares the precision conveyed by the two recordings? a)

9.40\,\text{s}

is less precise because the trailing zero is not significant b) Both readings have equal precision because the numerical value is the same c)

9.40\,\text{s}

is more precise because it contains one additional significant figure d)

9.4\,\text{s}

is more precise because it avoids possible rounding errors