Seismic waves are the waves that transport energy away from the focus of an earthquake. seismometers, such as the one shown here, measure the shaking of the earth as a result of earthquakes. what information from seismometers do scientists use to determine the energy of an earthquake?

a. the period of the earthquake motion

b. the amplitude of the earthquake motion

c. the frequency of the earthquake motion

d. the speed at which the earthquake travels

Sally turns on her cellular telephone to speak to her friend who is located thousands of miles away. which of the following best describes how such a telephone is able to transmit and receive information? a. the cellular telephone transmits, receives, and encodes information using only sound waves. b. the cellular telephone transmits, receives, and encodes information using only electromagnetic waves. c. the cellular telephone transmits information by electromagnetic waves to a receiver which then encodes them and produces sound. d. the cellular telephone transmits information by sound waves to a receiver which then encodes them and produces electromagnetic waves.