Significant Figures

The number of significant figures in a number is the count of all non-zero digits, zeros between significant digits, and trailing zeros in a decimal number. In , there are four significant figures: . Thus, the correct answer is option (2).

The volume of a cube is given by the formula: Substitute the given side length m: Rounding this to the correct number of significant figures:

The number 0.03240 has 4 significant figures. Leading zeros are not counted as significant figures. Here, '3', '2', '4', and the trailing zero after 4 are significant. Thus, the number has 4 significant figures.