communication

Question 1

What is AM?

Answer 1

Broadcasts a signal at a constant frequency, but will add a carrier wave. Amplitude Modulation. More interference. Greater distances and obstacles.

reacts with the ionsphere

Question 2

What is FM

Answer 2

Frequency is changed. Changes in frequency are detected. Clearer and higher quality signal. Less interference. Less distance, and can’t move around objects.

Question 3

Advantages of AM

Answer 3

Cheaper, greater distances, simple

Question 4

Advantages of FM

Answer 4

Better sound quality, less interference, less radiated power

Question 5

What is sound?

Answer 5

a mechanical wave that progress through a medium.

Question 6

How do speakers work?

Answer 6

motor and cone

higher volume higher amplitude. higher pitch higher frequency.

Question 7

How do microphones work?

Answer 7

the pressure of the sound waves on the diaphragm move the coil - generates current - vibration of sound - proudce currents - convert into sound

Question 8

Radio waves

Answer 8

electromagnetic waves to sound a radio consists of a circuit to transform power from a battery to radio frequency.

Question 9

Passing analog to digital

Answer 9

through the binary system and boolean logical. analogue wave into a digital number.

Question 10

What are Optical fibers

Answer 10

transmissions of data using light: reflection inside the glass.

Question 11

Advantages of Optical fibers

Answer 11

noise resistance, less signal attenuation, higher bandwidth (larger amount of information + faster), lighter

Question 12

Copper Cables

Answer 12

cheaper, stronger

Question 13

Satellites

Answer 13

Help meteorologists predict weather and track hurricanes. - Are used mainly for communication: beaming TV signals and phone calls around the world
- A group of more than 20 satellites make up the Global Positioning System, or GPS.

larger areas, higher resolution, faster, easier, cheaper

Question 14

Geo satellites

Answer 14

STATIONARY, the signal is clear and no need for adjustments

The signal may delay because of the distance

poor signal around the poles

TV, weather, GPS

Question 15

what is the motor in the speaker

Answer 15

drives the speaker back and forth - voice cole (copper wire and former, electricity moves through the wire generating a magnetic field, it can be made stronger, weaker, or turned off) ) + magnet (focuses the magnetic field, electric signal moves)

Question 16

what is the cone in the speaker

Answer 16

translates movement into pressure waves that travel through air. Voice coil movement into air, suspension system, dust cap, tinsel leads that can deform easily.

Question 17

disadvantages of AM

Answer 17

affected by storms, noise due to carrier wave

Question 18

disadvantages of FM

Answer 18

short distance, complex receiver and transmitter, expensive

Question 19

boolean logic

Answer 19

a mathematical approach to reasoning, and or if, takes on binary variables true 1 false 0

Question 20

analogue advantages

Answer 20

easier to process, best suited for audio and video, higher density = refined information

Question 21

digital advantages

Answer 21

less noise, lower cost, more secure, easy to store, longer distances, higher rate of transmission and data

Question 22

disadvantages of optical fibers

Answer 22

cost, installation, fragility

Question 23

polar satellites

Answer 23

resolution is higher

provide global coverage

not continuous viewing

Large scale mapping, military and global weather.