| A | B |
|---|
| Magnetic field | surrounds a magnet and exerts a force on magnetic materials |
| electromagnetic wave | made by vibrating electrical charges |
| photon | massless bundle of energy that behaves like a particle |
| radiation | transfer of thermal energy by electromagnetic energy |
| radio waves | electromagnetic wave with wavelengths longer 10 cm. |
| microwaves | electromagnetic wave with wavelengths between 0.1 and 30 cm |
| infrared waves | electromagnetic wave with wavelengths between 1/1000th and 700-billionth of meter |
| visible light | electromagnetic waves we cana detect with eyes |
| ultraviolet | electromagnetic wave with wavelengths between 400-billionth and 10-billionth of meter |
| x-rays | electromagnetic wave with wavelengths between 400-billionth and 10-trillionth of meter, photon-larger energy |
| gamma rays | electromagnetic wave with wavelengths about100-trillionth of meter, highest energy photon |
| amplitude | measure of size of disturbance wave produces |
| carrier wave | electromagnetic wave with specific frequency that station assigned |
| modulation | process - adding signal wave and carrier wave |
| analog signal | electric signals that change smoothly |
| digital signal | electrical signal -- on & off |
| transceiver | transmits & receives radio signal (cell phone) |
| Global Positioning System (GPS) | system to determine exact location on earth--24 satellites, etc., |
| signal wave | sounds produced at radio station converted to electrical signals |
