Question

Roughly, it takes light less than 0.000000003 of a second to travel a one-meter distance. Express this number in the form of a × 10 to the power of n where 1 ≤ a < 10 and is a one-digit number.
Responses

3 × 10 to the power of 8

3 × 10 to the power of 9

3 × 10 to the power of −8

3 × 10 to the power of −9

Answer 1

0.000000003 = 3 × 10^(-9), so the correct choice is: 3 × 10 to the power of −9.