Question

which two options are reasons that electromagnetic waves are effective for use in communication devices? a. they can carry information for long distances without wires. b. the entire electromagnetic spectrum can be used. c. both gamma rays and x - rays can be used. d. they can travel through matter and through space.

Explanation:

Electromagnetic waves can carry information over long - distances wirelessly, which is crucial for communication devices. Also, their ability to travel through matter and space enables wide - ranging communication. Not the entire electromagnetic spectrum is used for communication as some parts like gamma rays and X - rays are harmful and not practical for most common communication needs.

Answer:

A. They can carry information for long distances without wires.
D. They can travel through matter and through space.