Question

Which of the following is the most precise measurement?

• A. $3\times {10}^{-3}m$
• B. $0.0030m$
• C. $30\times {10}^{-4}m$
• D. $300\times {10}^{-5}m$

Answer 1

Answer: (A)

$3\times {10}^{-3}m$

To express any number, we always represent it in scientific notation.

for example:- $\Rightarrow 3.5\times {10}^2$

so, $0.003$ is express it in scientific notation.

$3.0\times {10}^{-3}$

Hence,

option $A$ is correct answer.