Question

Which of the following has the least number of significant figures?

• A. $1.64\times 10^{20}kg$
• B. $0.006m^2$
• C. $7.2180J$
• D. $5.045J$

Answer 1

Answer: (B)

According to the rules of significant figures.
$1.64\times 10^{20}kg$ has three significant figures.
$0.006m^2$ has one significant figures.
$7.2180J$ has five significant figures.
$5.045J$ has four significant figures