Question 1

analog signal

Accepted Answer

an electrical signal whose value changes smoothly over time

Question 2

carrier wave

Accepted Answer

specific frequency that a radio station is assigned and uses to broadcast signals

Question 3

digital signal

Accepted Answer

-an electric signal with only two possible values: ON and OFF

Question 4

electromagnetic wave

Accepted Answer

-waves created by vibrating electric charges

Question 5

gamma ray

Accepted Answer

-electromagnetic wave with a wavelength less than about 100 trillionths of a meter; usually emitted from a decaying atomic nucleus

Question 6

Global Positioning System

Accepted Answer

-system of satellites and ground monitoring stations that enable a receiver to determine its location at or above Earth's surface

Question 7

infrared wave

Accepted Answer

-electromagnetic wave with a wavelength between about 1 mm and 700 billionths of a meter

Question 8

microwave

Accepted Answer

electromagnetic wave with a wavelength between about 0.1 mm and 30 cm

Question 9

modulation

Accepted Answer

process of adding a signal to a carrier wave by altering the carrier wave's amplitude, frequency, or other property to transfer information

Question 10

photon

Accepted Answer

-massless energy-containing particle

Question 11

radio wave

Accepted Answer

-electromagnetic wave with a wavelength longer than about 10 cm, used for communication

Question 12

transceiver

Accepted Answer

device that transmits radio signals at one frequency and receives radio signals at a different frequency, allowing a user to talk and listen at the same time

Question 13

ultraviolet wave

Accepted Answer

-electromagnetic wave with a wavelength between about 400 billionths and 10 billionths of a meter

Question 14

visible light

Accepted Answer

electromagnetic waves with a wavelengths of 700 to 400 billionths of a meter that can be detected by human eyes

Question 15

X-ray

Accepted Answer

electromagnetic wave with a wavelength between about 10 billionths of a meter and 10 trillionths of a meter, often used for medical imaging

Question 16

as frequency increase, wavelength

Accepted Answer

decreases

Question 17

Whether or not electrons will be ejects from metal when light shines on the metal (photoelectric effect) depends on what?

Accepted Answer

frequency of light

Question 18

What is the difference between AM and FM?

Accepted Answer

-AM, which stands for Amplitude Modulated, and this type has one of the lowest frequencies, meaning that it can follow the curve of the earth, and can be received over much longer distances, but is affected by weather & large objects between the receiver & the transmitter. --FM which stands for Frequency Modulated, which means the frequency is much higher than AM, and the quality remains the same regardless of the distance, waves can also travel in a straight line, and waves do not follow the curve of the earth.

Question 19

Why do electromagnetic waves produce both an electric field and a magnetic field?

Accepted Answer

-the fields continually recreate each other

Question 20

Why do communication satellites use microwaves instead of radio waves?

Accepted Answer

microwaves travel more easily through the atmosphere

Question 21

electromagnetic spectrum

Accepted Answer

the range of wavelengths or frequencies over which electromagnetic radiation extends.

Question 22

frequency unit of measurement

Accepted Answer

hertz (Hz)

Question 23

radiant energy

Accepted Answer

energy carried by an electromagnetic wave

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