Approximately how much does a detectable gravitational wave alter the length of a 4-kilometer detector arm?

Answer

By less than one ten-thousandth the diameter of a proton

The distortion measured upon arrival on Earth is incredibly small, amounting to a change in length less than one ten-thousandth the diameter of a proton over a 4-kilometer stretch.

Approximately how much does a detectable gravitational wave alter the length of a 4-kilometer detector arm?

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