what is the power of 10 when 0.00503 is written in scientific notation?

Explanation:

Step1: Recall scientific - notation form

Scientific notation is $a\times10^{n}$, where $1\leqslant|a|\lt10$ and $n$ is an integer.

Step2: Rewrite 0.00503 in scientific notation

Move the decimal point 3 places to the right to get $a = 5.03$. Since we moved the decimal point 3 places to the right, $n=- 3$. So $0.00503 = 5.03\times10^{-3}$.

Answer:

$-3$