_______ cable consists of an inner copper core and a second sheath.

In fiber optics, the signal source is _____ waves.

At the lower end of the electromagnetic spectrum we have __________

_______are the highest frequency electromagnetic waves in use for data communications

Smoke signals are an example of communication through ________

Which of the following primarily uses guided media?

Which of the following is not a guided medium?

In an environment with many high-voltage devices, the best transmission medium would be _______.

What is the major factor that makes coaxial cable less susceptible to noise than twisted-pair?

The RG number gives us information about _________

In an optical fiber, the inner core is ______ the cladding.

When making connections in fiber optics, which of the following could contribute to signal distortion?

Radio communication frequencies range from ______

The radio communication spectrum is divided into bands based on _____

In ______ propagation, low-frequency radiowaves hug the earth surface

The type of propagation used in radio communication is highly dependent on the _____ of the signal

VLF propagation occurs in ______

If a satellite is in geosynchronous orbit, it completes one orbit in ______________

If the satellite is in geosynchronous orbit, its distance from the sending station _______

When a beam of light travels through media of two different densities, if the angle of incidence is greater than the critical angle, ________ occurs

When we talk about unguided media, usually we are referring to ______.

Propagation time is ________proportional to distance and _______proportional to propaganda speed.

The wavelength of a signal depends on the ________.

Using the Shannon formula to calculate the data rate for a given channel, if C = B, then _________