gc textbook chapter 11 Vibrations and Waves (id: 54914a51b)

本题目来源于试卷: gc textbook chapter 11 Vibrations and Waves，类别为 通用国际物理

[填空题]
The intensity of an earthquake wave passing through the goyd ,g(u8xdy ); (dwyEarth + bn( 2lvcyf0gdan6q ,is measured to be ga6v (n,2 +0dlnyqfbc$ 2\times10^{6 }J/m^2$ at a distance of 48 km from the source.
(a) What was its intensity when it passed a point only 1.0 km from the source?(round to one decimal place)$\approx$    $ \times10^{9 }W/m^2$
(b) At what rate did energy pass through an area of $5m^2$ at 1.0 km?    $ \times10^{10 }W$

参考答案:
空格1: 4.6±2%  空格2: 2.3±2% 


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