The production of x-radiation that occurs in an x-ray tube requires the movement of negatively charged particlestraveling from one side of the tube to the other. this movement of charges must occur in: a. vaccuum. b. a tungsten gas environment. c. an aqueous medium. d. any condition that exists inside the x-ray tube, including a nonvacuum.

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.