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  2. Illumination problem - Wikipedia

    en.wikipedia.org/wiki/Illumination_problem

    Roger Penrose's solution of the illumination problem using elliptical arcs (blue) and straight line segments (green), with 3 positions of the single light source (red spot). The purple crosses are the foci of the larger arcs. Lit and unlit regions are shown in yellow and grey respectively.

  3. Triboluminescence - Wikipedia

    en.wikipedia.org/wiki/Triboluminescence

    The most widely used tensile test method is used to characterize the mechanical properties of materials. From any complete tensile test record, one can obtain important information about the material's elastic properties, the character and extent of plastic deformation, yield, and tensile strengths and toughness.

  4. Luminous intensity - Wikipedia

    en.wikipedia.org/wiki/Luminous_intensity

    Light with the same radiant intensity at other wavelengths has a lower luminous intensity. The curve which represents the response of the human eye to light is a defined standard function y (λ) or V (λ) established by the International Commission on Illumination (CIE, for Commission Internationale de l'Éclairage ) and standardized in ...

  5. 10 Hard Math Problems That Even the Smartest People in the ...

    www.aol.com/10-hard-math-problems-even-150000090...

    Goldbach’s Conjecture. One of the greatest unsolved mysteries in math is also very easy to write. Goldbach’s Conjecture is, “Every even number (greater than two) is the sum of two primes ...

  6. Photoelectric effect - Wikipedia

    en.wikipedia.org/wiki/Photoelectric_effect

    An alteration in the intensity of light would theoretically change the kinetic energy of the emitted electrons, with sufficiently dim light resulting in a delayed emission. The experimental results instead show that electrons are dislodged only when the light exceeds a certain frequency —regardless of the light's intensity or duration of ...

  7. Apparent magnitude - Wikipedia

    en.wikipedia.org/wiki/Apparent_magnitude

    the brightest stellar event in recorded history (7200 light-years away) [38] −6.80: Alpha Centauri A: seen from Proxima Centauri b [39] −6.00: The total integrated magnitude of the night sky (incl. airglow) seen from Earth measuring about 0.002 lux −6.00: Crab Supernova of 1054: seen from Earth (6500 light-years away) [40] −5.90 ...