Question

How is 0.0120 written as a scientific notation ?

• A. $120\times {10}^{-4}$
• B. $1.2\times {10}^{-2}$
• C. $12\times {10}^{-3}$
• D. $12.0\times {10}^{-3}$

Answer 1

The correct option is B $1.2\times {10}^{-2}$

0.0120 is written as $1.2\times {10}^{-2}$, i.e.; decimal is moved two places towards the right so that there is only one non-zero digit before the decimal point and the exponent of 10 is - 2 in the scientific notation.

Whereas D is engineering notation.

Hence, the correct option is $\text{D}$