Chapter 12: Electromagnetic Waves

Photon

________: Waves that behave as a particle whose energy depends on the frequency of the waves.

Cathode raytubes

________ produce the images you see on television.

Transceiver

________: transmits one radio signal and receives another radio signal from a base unit.

CRT

An image is created when the three electron beams of the ________ sweep back and forth across the screen.

Overexposure

________ to ultraviolet rays can cause skin damage and cancer.

radio waves

To call on a mobile telephone, the telephone transmits ________ directly to a satellite.

Fluorescent materials

________ absorb ultraviolet waves and reemit the energy as visible light.

Microwaves

________ with wavelengths of about 1 cm to 20 cm are widely used for communication, such as for cellular telephones and satellite signals.

Radar

________ stands for RAdio Detecting And Ranging.

Electronic signals

________ are transmitted by FM radio stations by varying the frequency of the carrier wave.

GPS satellites

________ are owned and operated by the United States Department of Defense, but the microwave signals they send out can be used by anyone.

Cathode Ray Tube

________: a sealed vacuum tube in which one or more beams of electrons are produced.

Global Positioning System

The ________: a system of satellites, ground monitoring stations, and receivers that determine your exact location at or above Earths surface.

Waves

________ are produced by something that vibrates, and they carry energy from one place to another.

magnetic fields

Instead of transferring energy from particle to particle, electromagnetic waves travel by transferring energy between vibrating electric and ________.

Visible Light

________: the range of electromagnetic waves that you can detect with your eyes.

Ozone

________ is a molecule composed of three oxygen atoms.

Ultraviolet Waves

________: electromagnetic waves with wavelengths from about 400 billionths to 10 billionths of a meter.

Microwaves

________: Radio waves with wavelengths of less than about 30 cm.

Carrier Wave

________: The specific frequency of the electromagnetic wave that a radio station is assigned.

Communications satellites

________ use solar panels to provide the electrical energy they need to communicate with receivers on Earth.

wave

A(n) ________ is a disturbance that carries energy, and a particle is a piece of matter.

Gamma rays

________ are produced by processes that occur in atomic nuclei.

radio wave

A(n) ________ does not produce compressions and rarefactions as it travels through air.

Visible light

________ has wavelengths around 750 billionths to 400 billionths of a meter.

Electromagnetic Waves

________: made by vibrating electric charges and can travel through space where matter is not present.

Radiant Energy

The energy carried by an electromagnetic wave

Radio Waves

low-frequency electromagnetic waves with wavelengths longer than about 1 mm

Infrared Waves

a type of electromagnetic wave with wavelengths between about 1 mm and about 750 billionths of a meter

Ultraviolet Waves

electromagnetic waves with wavelengths from about 400 billionths to 10 billionths of a meter

X Rays

have wavelengths between about ten billionths of a meter and ten trillionths of a meter

Gamma Rays

Electromagnetic waves with wavelengths shorter than about 10 trillionths of a meter

Carrier Wave

The specific frequency of the electromagnetic wave that a radio station is assigned

Cathode-Ray-Tube

a sealed vacuum tube in which one or more beams of electrons are produced

Transceiver

transmits one radio signal and receives another radio signal from a base unit