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CHAPTER 21 VOCABULARY

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1.
1 point
a frequency within the electromagnetic spectrum, extending from around 30 hertz to 300 gigahertz is called a ______ wave
2.
1 point
the number of cycles that pass some point in one second.
3.
1 point
a radio frequency between superhigh frequency and very high
frequency
4.
1 point
a basic unit of measurement in telecommunication. It equals 1 million cycles per second.
5.
1 point
a system that merges a message onto a carrier wave by changing
the strength of the carrier signal is called an _______ modulation
6.
1 point
a metal that conducts an electrical current
7.
1 point
a system used to increase the capacity of a waveguide
8.
1 point
a frequency used by radio broadcast systems that radiates from the transmitter is called a __________ frequency
9.
1 point
Telecommunication is a communication process that depends on electromagnetic waves to carry a message over a distance.
10.
1 point
a basic unit of measurement in telecommunication. It equals 1 billion cycles per second.
11.
1 point
a document that identifi es characters, develops a situation, and communicates a story
12.
1 point
A basic unit of measurement in telecommunication. It equals 1 thousand cycles per second.
13.
1 point
multiplexing that divides time into very brief segments.
14.
1 point
UHF is a radio frequency between ultrahigh frequency and high
frequency
15.
1 point
a system that encodes a message on a carrier wave by changing its
frequency.
16.
1 point
the process in which magnetic lines of force increase and decrease in strength, causing electrons to fl ow in an adjacent wire.
17.
1 point
A technological device that changes energy of one form into energy of another form.
18.
1 point
a process through which on-camera performers are employed.
19.
1 point
the flow of electrons in both directions along a conductor, reversing at regular intervals is called an __________ current
20.
1 point
An abbreviation meaning audio-video
21.
1 point
the unit of measurement for the number of cycles per second
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