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  2. E band (waveguide) - Wikipedia

    en.wikipedia.org/wiki/E_band_(waveguide)

    The waveguide E band is the range of radio frequencies from 60 GHz to 90 GHz in the electromagnetic spectrum, [1] [2] corresponding to the recommended frequency band of operation of WR12 waveguides. These frequencies are equivalent to wave lengths between 5 mm and 3.333 mm. The E band is in the EHF range of the radio spectrum.

  3. Electromagnetic spectrum - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_spectrum

    A diagram of the electromagnetic spectrum, showing various properties across the range of frequencies and wavelengths. 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.

  4. List of physics mnemonics - Wikipedia

    en.wikipedia.org/wiki/List_of_physics_mnemonics

    When a variable with an exponent or in a function is covered, the corresponding inverse is applied to the remainder, i.e. = and = ⁡. More Magic Triangle image mnemonics in the style of a cheat-sheet for high-school physics – in the SVG file, hover over a symbol for its meaning and formula.

  5. High frequency - Wikipedia

    en.wikipedia.org/wiki/High_frequency

    HF's position in the electromagnetic spectrum.. High frequency (HF) is the ITU designation [1] for the band of radio waves with frequency between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decameters (ten to one hundred meters).

  6. Spectral band - Wikipedia

    en.wikipedia.org/wiki/Spectral_band

    A spectrum with various bands. Spectral bands are regions of a given spectrum, having a specific range of wavelengths or frequencies. Most often, it refers to electromagnetic bands, regions of the electromagnetic spectrum. [1] More generally, spectral bands may also be means in the spectra of other types of signals, e.g., noise spectrum.

  7. Optical radiation - Wikipedia

    en.wikipedia.org/wiki/Optical_radiation

    Optical radiation is the part of the electromagnetic spectrum with wavelengths between 100 nm and 1 mm. [1] [2] This range includes visible light, infrared light, and part of the ultraviolet spectrum. [3] Optical radiation is non-ionizing, [4] and can be focused with lenses and manipulated by other optical elements.

  8. Spectral signature - Wikipedia

    en.wikipedia.org/wiki/Spectral_signature

    The spectral signature of an object is a function of the incidental EM wavelength and material interaction with that section of the electromagnetic spectrum. The measurements can be made with various instruments, including a task specific spectrometer , although the most common method is separation of the red, green, blue and near infrared ...

  9. Bessel beam - Wikipedia

    en.wikipedia.org/wiki/Bessel_beam

    The mathematical function which describes a Bessel beam is a solution of Bessel's differential equation, which itself arises from separable solutions to Laplace's equation and the Helmholtz equation in cylindrical coordinates. The fundamental zero-order Bessel beam has an amplitude maximum at the origin, while a high-order Bessel beam (HOBB ...

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