an electrical signal whose value changes smoothly over time

• analog signal

• digital signal

• carrier wave

• radio wave

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

• carrier wave

• analog signal

• digital signal

• transceiver

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

• digital signal

• analog signal

• carrier wave

• modulation

waves created by vibrating electric charges; consists of vibrating electric and magnetic fields, and can travel through a vacuum or through matter

• electromagnetic wave

• carrier wave

• ultraviolet wave

• radio wave

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

• gamma ray

• photon

• X-ray

• ultraviolet wave

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

• Global Positioning System

• carrier wave

• transceiver

• modulation

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

• infrared wave

• microwave

• radio wave

• ultraviolet wave

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

• microwave

• infrared wave

• ultraviolet wave

• visible light

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

• modulation

• analog signal

• digital signal

• transceiver

massless energy-containing particle that electromagnetic wave sometimes behave like; the frequency of the electromagnetic wave increases with the energy of the particle

• photon

• gamma ray

• transceiver

• carrier wave