why do electromagnetic waves not require a medium for travel?
a)
because electromagnetic waves travel too fast for stationary particles to move with them
b)
because electromagnetic waves transmit energy without compressing the particles of the medium
c)
because electromagnetic waves generate their own particles for compression and use these for movement
d)
because electromagnetic waves move in two-dimensional space, the particles of mediums exist in 3-d space

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.