A change in the observed frequency of a wave.
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The SI unit of electric charge.
The point on the Earth's surface directly above the point at which an earthquake originates.
A term used in physics and electronics, modulation means changing some aspect of a periodic phenomenon, generally the frequency, amplitude, or phase of a waveform.
A reaction in which oxidation and reduction occur together.
When a plant grows in a particular direction in response to an external stimulus.