Fill in the blanks with the correct values to two significant figures assuming sound propagates as a spherical wave. If the intercity of a sound is Io at a given location and then the distance to the sound source is doubled the intensity decreases to a ___Io and the decibel level decreases by ___dB.

Much of the information taught in earth-space science would not be available if it weren’t for our remote sensing abilities. explain two ways our remote sensing strategies contribute to our knowledge of these topics.

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.

Definition: this is the weighted average of all of the isotopes of an element.