Final answer:
The number (0.5 * 10³) is not in proper scientific notation because the coefficient is not between 1 and 9. It should be rewritten as 5 * 10² to be in correct scientific notation. Option D is correct.
Step-by-step explanation:
In scientific notation, a number is expressed as the product of a number between 1 and 10 and a power of 10.
This allows very large or very small numbers to be written in a more compact form. Let’s analyze each option:
A. 6 * 10²⁵ - This is in scientific notation as it is written as 6 multiplied by 10 raised to the power of 25.
B. 2.01 * 10⁻² - This is in scientific notation as it is written as 2.01 multiplied by 10 raised to the power of -2.
C. 1.3 * 10⁻⁴ - This is in scientific notation as it is written as 1.3 multiplied by 10 raised to the power of -4.
D. 0.5 * 10³ - This is not in scientific notation as it should be written as 5 multiplied by 10 raised to the power of 2, which would be expressed as 5 * 10² in scientific notation.
Hence, option D is correct.