InterviewSolution
Saved Bookmarks
| 1. |
Charles Richter defined the magnitude of an earthquake to beM = log_(10) I/S, where I is the intensity of the earthquake (measured bythe amplitude of a seismograph reading taken 100 km from the epicentre of the earthquake) and S is the intensity of a ''standed earthquake'' (whose amplitude is 1 micron =10^(-1) cm). Each number increase on the Richter scale indicates an intensity ten times stronger. For example. an earthquake ofmagnitude 5. An earthquake of magnitude 7 is 100 times stronger then an earthquake of magnitude 5. An earthquake ofmagnitude 8 is 1000 times stronger than an earthquake of magnitude 5. The earthquake in city Aregistered 8.3 on the Richter scale. In the same year, another earthquake was recorded incity Bthat was four times stronger. What was the magnitude of the earthquake in city B ? |
|
Answer» `:.8.3 = log_(10). (I_(A))/S` Now`M_(B) = log_(10). (I_(B))/S` Where` I_(B) = 4I_(A)*` ` :.M_(B) = log_(10). (4I_(A))/S` ` = log_(10) 4+ log_(10). (I_(A))/S` ` = 0.6020 + 8.3` ` = 8.9020` So, magnitude of EARTHQUAKE in CITY B is ` 8.9020`. |
|