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  2. Authenticity (philosophy) - Wikipedia

    en.wikipedia.org/wiki/Authenticity_(philosophy)

    Authenticity is a concept of personality in the fields of psychology, existential psychotherapy, existentialist philosophy, and aesthetics.

  3. Radio spectrum - Wikipedia

    en.wikipedia.org/wiki/Radio_spectrum

    The radio spectrum is the part of the electromagnetic spectrum with frequencies from 3 Hz to 3,000 GHz (3 THz).Electromagnetic waves in this frequency range, called radio waves, are widely used in modern technology, particularly in telecommunication.

  4. Electromagnetic spectrum - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_spectrum

    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 gamma rays. The electromagnetic waves in each of these bands have different characteristics, such as how they are ...

  5. Authenticity in art - Wikipedia

    en.wikipedia.org/wiki/Authenticity_in_art

    Artistic authenticity is a requirement for the inscription of an artwork to the World Heritage List of the Educational, Scientific, and Cultural Organisation of the United Nations ; [4] the Nara Document on Authenticity (1994) stipulates that artistic authenticity can be expressed through the form and design; the materials and substance; the ...

  6. Orders of magnitude (frequency) - Wikipedia

    en.wikipedia.org/.../Orders_of_magnitude_(frequency)

    Electromagnetic – cordless telephone frequency introduced in 2003 10 10: 10 GHz: 3 GHz to 30 GHz: Electromagnetic – super high frequency: 60 GHz: Electromagnetic – 60 GHz Wi-Fi (WiGig) introduced in 2010 10 11: 100 GHz 160.2 GHz: Electromagnetic – peak of cosmic microwave background radiation: 845 GHz: Fastest transistor (December 2006 ...

  7. “Keeping It Real”: 17 Celebrity Photos That Reveal Lesser ...

    www.aol.com/17-raw-real-celebrity-photos...

    Image credits: drewbarrymore #6 Katy Perry's Postpartum Body. The hitmaker shared a photo of her postpartum body four days after giving birth to her and fiancé Orlando Bloom’s daughter, Daisy ...

  8. Sound - Wikipedia

    en.wikipedia.org/wiki/Sound

    Pitch is perceived as how "low" or "high" a sound is and represents the cyclic, repetitive nature of the vibrations that make up sound. For simple sounds, pitch relates to the frequency of the slowest vibration in the sound (called the fundamental harmonic). In the case of complex sounds, pitch perception can vary.

  9. Art forgery - Wikipedia

    en.wikipedia.org/wiki/Art_forgery

    The conference failed to solve the problem; while most art historians and archeologists denounced it, the scientists present believed the statue to be authentic. To this day, the Getty Kouros' authenticity remains a mystery and the statue is displayed with the date: "Greek, 530 B.C. or modern forgery". [44]