Which two statements describe reasons that semiconductors must be included in a solar cell?
A. They form a zone of separation between the glass layer and the
terminal layer.
B. They provide a path through which released electrons move to
form an electric current.
C. They provide a source of electrons to be released by the
photoelectric effect.
OD. They provide a path through which electrons exit the surface of
the cell and never return.

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.