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  2. Frequency allocation - Wikipedia

    en.wikipedia.org/wiki/Frequency_allocation

    Frequency allocation. Frequency allocation (or spectrum allocation) is the part of spectrum management dealing with the designation and regulation of the electromagnetic spectrum into frequency bands, normally done by governments in most countries. [ 1] Because radio propagation does not stop at national boundaries, governments have sought to ...

  3. Electromagnetic spectrum - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_spectrum

    The electromagnetic spectrum is the full range of electromagnetic radiation, organized by frequency or wavelength. The spectrum is divided into separate bands, with different names for the electromagnetic waves within each band. From low to high frequency these are: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and ...

  4. Spectrogram - Wikipedia

    en.wikipedia.org/wiki/Spectrogram

    The legend to the right shows that the color intensity increases with the density. A spectrogram is a visual representation of the spectrum of frequencies of a signal as it varies with time. When applied to an audio signal, spectrograms are sometimes called sonographs, voiceprints, or voicegrams.

  5. File:United States Frequency Allocations Chart 2016 - The ...

    en.wikipedia.org/wiki/File:United_States...

    File:United States Frequency Allocations Chart 2016 - The Radio Spectrum.pdf. Size of this JPG preview of this PDF file: 800 × 512 pixels. Other resolutions: 320 × 205 pixels | 640 × 409 pixels | 1,024 × 655 pixels | 1,280 × 819 pixels | 2,560 × 1,638 pixels | 6,300 × 4,031 pixels. This is a file from the Wikimedia Commons.

  6. Emission spectrum - Wikipedia

    en.wikipedia.org/wiki/Emission_spectrum

    Emission spectrum of a ceramic metal halide lamp. The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to electrons making a transition from a high energy state to a lower energy state. The photon energy of the emitted photons is equal to the energy difference ...

  7. Spectral line - Wikipedia

    en.wikipedia.org/wiki/Spectral_line

    A spectral line is a weaker or stronger region in an otherwise uniform and continuous spectrum. It may result from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies. Spectral lines are often used to identify atoms and molecules. These "fingerprints" can be compared to the previously collected ones ...

  8. Color vision - Wikipedia

    en.wikipedia.org/wiki/Color_vision

    Color vision. Colorless, green, and red photographic filters as imaged by camera. Color vision, a feature of visual perception, is an ability to perceive differences between light composed of different frequencies independently of light intensity. Color perception is a part of the larger visual system and is mediated by a complex process ...

  9. Nolan Chart - Wikipedia

    en.wikipedia.org/wiki/Nolan_Chart

    The Nolan Chart in its traditional form. The Nolan Chart is a political spectrum diagram created by American libertarian activist David Nolan in 1969, charting political views along two axes, representing economic freedom and personal freedom.

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