Answer asap for 40 points

the doppler effect is the result of a sound source that causes the sound to appear higher or lower than its true as a sound source approaches an observer, the distance between each in the wave is this causes a perceived pitch. as a source moves away from an observer, the distance between each crest in the wave is this causes a perceived pitch. the size of the pitch is determined by the speed of the source relative to the speed of

word bank

higher
shift
increased
moving
lower
pitch
sound
crest
shortened

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.