informatioin systems

Question 1

device for transmitting/and or receiving radio waves

Answer 1

Aerial

Question 2

measurement of frequency; the number of waves to pass a point in one second

Answer 2

Hertz

Question 3

another word for aerial

Answer 3

Antenna

Question 4

What are longitudinal waves?

Answer 4

waves that compress energy in the same direction as the wave movement

Question 5

A device used to increase sounds produced by a radio

Answer 5

ampliefied/amplifier

Question 6

electrical circuit device that selects wave frequesncies

Answer 6

tuner

Question 7

a device that finds and receives signals, separates and filters waves

Answer 7

detector

Question 8

what do waves do ?

Answer 8

carry and transmit energy

Question 9

waves can be measured in terms of ?

Answer 9

amplitude, frequesncy, wavelength

Question 10

the information transfer process ?

Answer 10

code, encode,transmit(ter), decode(r)
OR
code, message, transmission, decoder

Question 11

energy stored in chemicals ?

Answer 11

chemical energy

Question 12

potential energy ?

Answer 12

energy that can be released later

Question 13

movement meant energy is ?

Answer 13

kinetic

Question 14

energy from differences in temperature

Answer 14

heat

Question 15

light energy is ?

Answer 15

energy from a light source

Question 16

energy released as traveling vibrations ?

Answer 16

sound energy

Question 17

energy carried as waves at the speed of light ?

Answer 17

electromagentic

Question 18

energy carried by electrons ?

Answer 18

electrical

Question 19

energy coming from the sun ?

Answer 19

solar

Question 20

nuclear energy is ?

Answer 20

energy released from converting mass into energy during fission or fusion

Question 21

can energy be created or destroyed ?

Answer 21

no, just changed from one form of energy to another

Question 22

what is it called when waves are reflected un all directions from an uneven surface

Answer 22

scattering (a special type of reflection)

Question 23

sound waves can only be transferred by a ?

Answer 23

medium e.g air

Question 24

can only travel short distances as ground waves, have a short wavelength

Answer 24

Microwaves

Question 25

radio waves are a type of ?

Answer 25

electromagnetic wave

Question 26

AM

Answer 26

amplitude modulated

Question 27

FM

Answer 27

frequency modulated

Question 28

guess the wave- | used for FM and AM radio, television, mobile phones, long waves such as military communication

Answer 28

Ground Waves

Question 29

guess the wave- | is reflected by the ionosphere, used for short wave radio such as search and rescue, police, military and AM radio

Answer 29

Sky waves

Question 30

guess the wave- | relayed by satellite, used for UHF and VHF television, international phone calls

Answer 30

Space waves

Question 31

geostationary satellites are how high above earths surface ?

Answer 31

36,000 km, in a fixed position

Question 32

a byte ?

Answer 32

are 8 bits

Question 33

define analogue

Answer 33

an information transmission without on and off signals

Question 34

bandwidth

Answer 34

the range of frequencies over which an electromagnetic wave is transmitted

Question 35

cathode ray tube

Answer 35

- vaccum sealed space | - shoots electrons at a screen with phosphor

Question 36

cladding

Answer 36

the material coating optical fibres

Question 37

the carrier demodulator

Answer 37

removes the carrier wave from the radio signal

Question 38

information systems

Answer 38

technology used for the purpose of communication

Question 39

multiplexing

Answer 39

hold multiple signals

Question 40

optical

Answer 40

involving light energy

Question 41

polyurethane

Answer 41

waterproof covert of fibre optics

Question 42

how do pictures appear on a television screen ?

Answer 42

due to the cycling of an electron beam across the screen