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| electromagnetic waves (radiation) |
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Definition
| Another term for light. Light waves are fluctuations of electric and magnetic fields in space. |
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| The smallest (quantum) unit of light/electromagnetic energy. Photons are generally regarded as particles with zero mass and no electric charge. |
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| speed of light (in vacuum) |
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| The speed at which electromagnetic radiation propagates in a vacuum; it is defined as 299 792 458 m/s (186,000 miles/second). |
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| # of waves passing a given point within a specific unit of time (sec.) |
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| Distance between waves expressed in metric units |
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| Power measured by the peak height of the wave. (expressed in watts) |
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| Loss of energy (decrease in amplitude of waveform) due to absorption by air or ground. |
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| the rate at which work is done or energy is produced or consumed (Watts) |
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| A negatively charged particle commonly found in the outer layers of atoms. The electron has only 0.0005 the mass of the proton. |
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| The change of potential energy experienced by an electron moving from a place where the potential has a value of V to a place where it has a value of (V+1 volt). |
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Definition
Circuits have three elements:
Voltage
Current
Resistance |
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| Relative timing of a wave cycle. |
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| Encoding information on radio waves |
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Definition
| Decoding information from radio waves |
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Definition
| Convert sound or light into RF prior to modulation |
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Term
| How fast do sound waves travel through air? |
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Definition
| 340 meters p/second, or 760 mph |
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Definition
| Two or more different signals are placed on a single channel (FM, Color TV, etc.) |
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| Frequency division multiplexing (FDM) |
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Definition
| Unused frequencies are used for information |
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| Path taken by radio waves thru atmosphere |
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| - tower is radiating element |
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| orientation of electromagnetic waves to the surface of the earth |
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| a region where the air is compressed |
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Definition
| the opposite of a compression, the air pressure is slightly lower than normal |
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Term
| Steady Barometric Pressure |
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Definition
| the normal air pressure of the atmosphere |
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Definition
| the power falling on, emitted by, or passing through a specific area, measured in W/m2 |
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| if similar sounds arrive at the listener’s ears, the sounds that arrive first determine the perceived direction of the sound’s origin, even if the later sound is louder |
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Term
| Is the human ear linear or non-linear? |
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Definition
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| difference between sounds (tonal quality or “sound color”) |
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| the distance between two notes where one has double the frequency of the other |
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| SOUND ENVELOPES HAVE 3 STAGES: |
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| corrects cancellation that can occur if two microphones are not wired correctly |
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| Measurement of the resistance presented to the flow of electrical signal voltage |
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| Hi Z has (greater,lesser) output level |
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| Low Z has (greater, lesser) output level |
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| attenuates all frequencies below a certain point |
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| attenuates all frequencies above a certain point |
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Definition
| Used to cut out an extremely narrow bandwidth |
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