What is the approximate order of magnitude for the change in length in a detector arm caused by a passing gravitational wave?

Question

Quizplus · Accepted Answer

The change in length caused by a passing gravitational wave is typically on the order of 10^-18 meters or less. Therefore, the best choice is B as it represents a change in length of 10^-18 meters (10^{) minus 20 times the order of magnitude of meters (20}), which is still on the order of 10^-18 meters.

What Is the Approximate Order of Magnitude for the Change