Question

$\text{Mass of a dust particle which is}$
$0.0000000007\text{kg},\text{in standard form it can be written as}$.

• A. $7\times {10}^{-10}$
• B. $7\times {10}^{-9}$
• C. $7\times {10}^{-11}$
• D. $7\times {10}^{-8}$

Answer 1

The correct option is A $7\times {10}^{-10}$

Given : $\text{Mass of dust particle}=0.0000000007kg$
$\text{It can be written in standard form}$
$\text{by moving from right most position to left}$
$\text{most position where the point symbol starts}$
$\text{and count the number of places}$
$\text{it took to reach there.}$
$\text{The number of places are '10'}$.
$0.0000000007=\frac{7}{{10}^{10}}$
$\therefore 0.0000000007=7\times {10}^{-10}$