Question

0.0008 m= $8\times {10}^{-x}m$. Find x.

Answer 1

Orders of magnitude are written in powers of $10$. For example, the order of magnitude of $1500$ is $3$, since $1500$ may be written as $1.5\times {10}^3$. Similarly in the above question, $0.0008$ can be written as $0.8\times {10}^{-3}$.

Hence its order of magnitude is ${10}^{-3}$.