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Light exerts physical pressure on objects in its path, a phenomenon which can be deduced by Maxwell's equations, but can be more easily explained by the particle nature of light: photons strike and transfer their momentum. Light pressure is equal to the power of the light beam divided by c, the speed of light.
Light whose wavelength is well outside the visible spectrum has a luminous energy of zero, regardless of the amount of radiant energy present. The SI unit of luminous energy is the lumen second , which is unofficially known as the "talbot" in honor of William Henry Fox Talbot .
tech: the power consumption of a typical Light-emitting diode (LED) light bulb 8 tech: human-powered equipment using a hand crank. [14] 10 1: deca-(daW) 1.4 × 10 1: tech: the power consumption of a typical household compact fluorescent light bulb: 2–4 × 10 1: biomed: approximate power consumption of the human brain [15] 3–4 × 10 1
A lighthouse sends a powerful beam of light which travels significant distances from the point of origin. This light constantly rotates in a circular motion around the lighthouse. This thought experiment proposes that light moving in this situation is actually traveling faster than the speed of light.
c is the speed of light in vacuum h is the Planck constant The photon energy at 1 Hz is equal to 6.626 070 15 × 10 −34 J , which is equal to 4.135 667 697 × 10 −15 eV .
This is a list of sources of light, the visible part of the electromagnetic spectrum.Light sources produce photons from another energy source, such as heat, chemical reactions, or conversion of mass or a different frequency of electromagnetic energy, and include light bulbs and stars like the Sun. Reflectors (such as the moon, cat's eyes, and mirrors) do not actually produce the light that ...
Yield of Castle Bravo, the most powerful nuclear weapon tested by the United States [185] 7.9×10 16 J Kinetic energy of a regulation baseball thrown at 99% the speed of light (KE = mc^2 × [γ-1], where the Lorentz factor γ ≈ 7.09). [186] 9×10 16 J: Mass–energy of 1 kilogram of antimatter (or matter) [187] 10 17 1.4×10 17 J
In photometry, luminous flux or luminous power [citation needed] is the measure of the perceived power of light. It differs from radiant flux , the measure of the total power of electromagnetic radiation (including infrared , ultraviolet , and visible light), in that luminous flux is adjusted to reflect the varying sensitivity of the human eye ...