Chapter 18 Science

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Telephone messages are sent by

physical transmission

The smallest piece of electronically produced picture is called

pixel

Microwaves are used for sending telecommunication signals in

telephones

The area covered by each microwave relay antenna mounted on towers is called a

cell

One disadvantage of analog signals is that they

change continuously

Language is an example of a

code

To send sound using electricity, the first step is to

convert the sound into an electric current

Morse code was developed for

ship-to-ship and ship-to-shore communication

Over the telephone line, the sound waves from your voice are transmitted

signal by a transducer/microphone

A cordless phone is a

small transceiver

When you talk on the telephone, the sound waves of your voice are converted to an electrical signal by a

speaker cone

Each binary digit is called a

bits

A computer keyboard is an example of a

input device

Random-access memory, RAM, is contained on

microchips

A computer modem is

a modulator and demodulator

In 1989, the web was

a resource for scientific information

A code is

a set of rules used to interpret data that convey information

A digital signal is

a signal that can be represented as a sequence of discrete values

An analog signal

a signal whose properties such as amplitude and frequency, can change continuously in a given range

Optical fibers

a transparent thread of plastic or glass that transmits light

The transfer of information by means of electromagnetic waves through space is called

atmospheric transmission

All input devices provide data to the computer in the form of a

binary code

In a computer, the operating system is stored on

bios

Microwaves are a form of

electromagnetic radiation

For radio broadcast, sound signals are converted to

electromagnetic waves

The binary number system is associated with

electronic data

All the physical components of a computer are called

hardware

Television converts electromagnetic waves into

images and sound

A signal is a sign that represents

information

A computer monitor is an example of a

input and output device

A cathode-ray tub in black-and-white TV makes a beam of electrons from

negatively charged cathode

By the year 2009, all television signals will be broadcast

only digital high def called HDTV for short

When a computer is first turned on, the first program executed by the computer is the

operating system

During a telephone call, the incoming electrical signals are converted to sound waves by

transducer

The antenna of your radio receiver works as a

transducer

What is a satellite footprint

transmitting antenna of a communication satellite being aimed to cover the largest land area without becoming weak

Computers process binary data in groups of

zeros and ones


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