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  2. List of physics concepts in primary and secondary education ...

    en.wikipedia.org/wiki/List_of_physics_concepts...

    This page was last edited on 19 September 2023, at 23:35 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  3. List of light sources - Wikipedia

    en.wikipedia.org/wiki/List_of_light_sources

    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 ...

  4. Light - Wikipedia

    en.wikipedia.org/wiki/Light

    Another example is incandescent light bulbs, which emit only around 10% of their energy as visible light and the remainder as infrared. A common thermal light source in history is the glowing solid particles in flames, but these also emit most of their radiation in the infrared and only a fraction in the visible spectrum.

  5. Sources of electrical energy - Wikipedia

    en.wikipedia.org/wiki/Sources_of_electrical_energy

    The mechanical power needed to assist in this production is provided by a number of different sources. These sources are called prime movers, and include diesel, petrol and natural gas engines. Coal, oil, natural gas, biomass and nuclear energy are energy sources that are used to heat water to produce super-heated steam. Non-mechanical prime ...

  6. Luminous intensity - Wikipedia

    en.wikipedia.org/wiki/Luminous_intensity

    The frequency of light used in the definition corresponds to a wavelength in a vacuum of 555 nm, which is near the peak of the eye's response to light. If the 1 candela source emitted uniformly in all directions, the total radiant flux would be about 18.40 mW, since there are 4 π steradians in a sphere.

  7. Physical Science Study Committee - Wikipedia

    en.wikipedia.org/wiki/Physical_Science_Study...

    Doubleday published a "Science Studies Series" of over 50 small paperback books on related scientific subjects at a high school level, covering topics such as crystal growing, waves and beaches, subatomic particles, the universe, and biographies of notable scientists.

  8. Category:Light sources - Wikipedia

    en.wikipedia.org/wiki/Category:Light_sources

    This page was last edited on 15 September 2013, at 04:23 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  9. Luminous efficacy - Wikipedia

    en.wikipedia.org/wiki/Luminous_efficacy

    Luminous efficacy can be normalized by the maximum possible luminous efficacy to a dimensionless quantity called luminous efficiency.The distinction between efficacy and efficiency is not always carefully maintained in published sources, so it is not uncommon to see "efficiencies" expressed in lumens per watt, or "efficacies" expressed as a percentage.

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