# Seismographs and Half-Life

Question 1:

A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 5.9 x 10^2 µm. Find this earthquake's magnitude on the Richter scale.

Question 2:

An artifact was found and tested for its carbon-14 content. If 81% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? Assume that carbon-14 has a half-life of 5,730 years.

© BrainMass Inc. brainmass.com October 10, 2019, 5:14 am ad1c9bdddfhttps://brainmass.com/math/algebra/seismographs-half-life-498175

#### Solution Preview

1. Magnitude = logA - 2.48 + 2.76logD = log(590) -2.48 + 2.76 log(300) = ...

#### Solution Summary

The expert examines seismographs and half-life.

$2.19