Which of the following values has the greatest number of significant figures? justify your answer?
0.0004200 grams
714 meters
3.1*10^8 seconds
0.0994 volts

someone

The highest value with greatest significant figures is 0.0004200 grams.

Option A

Explanation:

Significant numbers are values, often measurements that contribute to the accuracy of the value. We'll start by calculating significant numbers with the first digit without zero. Calculate the number of significant digit from a series of numbers.

These have several rules to be followed for the calculation of number of significant figure at a given value. Following lead with zeros are not significant rules, we have, for option A, number of significant figure number values as 4. And, option D, we have the significant figure number value as 3. While for option B, significant figure all non-zero digits so as 3.

For option C, we have significant figure as 2 as rule is if the digit ends "0" and no decimal point, then all zeros between the position where decimal point is and non-zero numbers are not significant. Thereby, the greatest significant figure value be the option A following the rule of trailing zeros.