How times more powerful is the Earthquake ?

An earthquake that is one point higher on the Richter Scale than another earthquake is actually 10 times more powerful!
Knowing that, how much more powerful would an earthquake be if it was HALF a point higher on the Richter Scale?

Hint: The answer is NOT 5 times more powerful (that would be too easy).

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Answer : It would be the square root of 10 times more powerful (roughly 3.16 times more powerful).