Question

The radius of Earth is written as 0.64 × 10⁷ m in scientific notation. What is its order of magnitude?

Options

• 7

• 0.64

• 10

• -19

Answer 1

7

Reason:

In scientific notation A × 10ⁿ, the order of magnitude is the exponent n. For 0.64 × 10⁷ m, the order of magnitude is 7.