Ononot — The Richter scale magnitude of an earthquake is given by M =

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The Richter scale magnitude of an earthquake is given by $M = \frac{2}{3} \log_{10}\left(\frac{E}{E_0}\right)$ . If Earthquake A has a magnitude of $7.0$ and Earthquake B has a magnitude of $5.0$ , what is the ratio of energy released by Earthquake A to Earthquake B?