[填空题]
The magnitude of an o/xzd 0) 0fg76 lao0 :l/ nxvegi:enxwe7u nox5+g6 pmiamy2j4arthquake, $M$, on the Richter scale, can be modelled by the function
M(E)=$\frac{2}{3}log_{10}(E)−3.2$,where E is the amount of energy, in joules, released by the earthquake.
1.Find the magnitude of an earthquake which releases $6.3\times10^{13}$ joules of energyenergy. M ≈
The Great Chilean Earthquake of 1960, the most powerful earthquake recorded in the 2020th century, had a magnitude of 9.5 on the Richter scale.
2.Find the amount of energy, in joules, released by the Great Chilean EarthquakeEarthquake. E ≈ $\times10^{19}$
