Here's how to determine the power of 10 when 0.00503 is written in scientific notation:

1. Move the decimal point:

To get a number between 1 and 10, move the decimal point three places to the right:

0.00503 → 5.03

2. Count the moves:

You moved the decimal three places to the right. This means the power of 10 is negative three (-3).

3. Scientific Notation:

Therefore, 0.00503 in scientific notation is 5.03 x 10⁻³