Telephone, Radio, and Television

Question 1

What is an Electret?

Answer 1

A material with a constant electric charge.

Question 2

What is an Electret microphone?

Answer 2

A type of microphone that uses an electrically charged membrane mounted on an electret.

Question 3

What is a Speaker Cone?

Answer 3

A thin membrane in the speakers of a telephone.

Question 4

What is Atmospheric Transmission?

Answer 4

The passage of an electromagnetic wave through the atmosphere between a transmitter and a receiver.

Question 5

What is Physical Transmission?

Answer 5

Transmission of signals by wires.

Question 6

What is a Diode?

Answer 6

A device used to convert alternating current.

Question 7

What is a Transceiver?

Answer 7

A transmitter or receiver.

Question 8

What is a Cell?

Answer 8

The area covered by each antenna.

Question 9

What is a Carrier?

Answer 9

A wave that can be modulated to send a signal.

Question 10

What is a Modulate?

Answer 10

The changing of a wave’s amplitude or frequency to send a signal.

Question 11

What are the two types of Modulation?

Answer 11

AM and FM.

Question 12

What is Line-Of-Sight Transmission?

Answer 12

The ability of high frequency transmissions to only be carried by simple straight lines.

Question 13

What does AM stand for?

Answer 13

Amplitude modulation.

Question 14

What does FM stand for?

Answer 14

Frequency modulation.

Question 15

What are Ground Waves?

Answer 15

Waves that follow the curvature of the Earth for some distance.

Question 16

What are Sky Waves?

Answer 16

Sky Waves are waves that spread out from antennas into the sky and are reflected in the upper atmosphere, which contains charged particles.

Question 17

What is a Tuner?

Answer 17

A device that adjusts antennas.

Question 18

What is a Cathode-Ray Tube?

Answer 18

A tube that uses an electron beam to create a display on a phosphorescent screen.

Question 19

What is a Pixel?

Answer 19

The smallest element of a display image.