Final answer:
The Richter scale measures the destructive energy of an earthquake, and a magnitude 3 earthquake would be recorded by a seismograph. It's a logarithmic scale based on wave amplitude and energy carried, helpful for understanding seismic activity.
Step-by-step explanation:
The scale on which the destructive energy of an earthquake is measured is called the Richter scale. An earthquake that measures 3 on this scale would indeed be recorded by a seismograph. The Richter scale is a logarithmic scale that is based on the amplitude of the earthquake waves and the energy they carry. Although a magnitude 3 earthquake is considered minor and often not felt by people, it is still detected and recorded by seismographic equipment. The Richter scale gives a numerical representation to the energy produced by an earthquake, with higher numbers indicating stronger earthquakes.
All waves carry energy, and the energy of earthquake waves can result in visible destruction. Large-amplitude earthquakes produce significant ground displacement and greater damage, while as waves spread out from the source, their amplitude decreases, reducing the damage further away. Therefore, the Richter scale is an essential tool for measuring an earthquake's potential for damage and helps in the understanding and preparation of seismic activity.