[2 points] The intensity of an earthquake wave passing throu…

[2 points] The intensity of an earthquake wave passing through the Earth is measured at two different locations on the Earth’s surface. The first measurement is 1.4×106 W/m2 at a distance of 51 km from the source. The second measurement is found to be 4.1×109 W/m2. How far from the source in kilometers was the second measurement made?