Approximately 30-40% of the energy consumed by a tube light is converted into visible light. The rest of the energy is lost as heat due to the inefficiencies in the lighting process.
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When the length of a wire is doubled from L to 2L, the resistance of the wire will change due to the relationship between resistance and length in electrical conductors.
If the radius of a wire is halved, its resistance will increase. The resistance of a wire is inversely proportional to the cross-sectional area, which is proportional to the square of the radius. Therefore, halving the radius increases the resistance ...
When the temperature of a conductor material is increased, its electrical resistance increases while its electrical conductivity decreases. This is because the increased thermal energy causes more frequent collisions between the charge carriers and the atoms in the material, impeding ...
Substances which do not have free electrons in their normal state, but can obtain free electrons under special conditions like high temperature or addition of impurities, are called semiconducting substances. These materials are crucial in modern electronics, as their conductivity ...
Arsenic is not a semiconductor. Germanium, silicon, and selenium are all semiconductors used extensively in electronics for their ability to conduct electricity under certain conditions, while arsenic, although used as a doping agent in semiconductors, is not a semiconductor itself.
The characteristic of a superconductor is zero permittivity. Superconductors exhibit the unique property of having no electrical resistance when cooled below a certain critical temperature, allowing electric current to flow without any energy loss. This phenomenon is utilized in various ...
Light travels in optical fibers due to total internal reflection. This phenomenon occurs when light strikes the boundary of the fiber core at an angle greater than the critical angle, causing it to reflect back into the core rather than ...
A magnifying lens is a convex lens that is thicker in the middle and thinner at the edges. It is used to enlarge the apparent size of objects when viewed through it by bending light rays inward, causing them to ...
Lambert’s law relates to the absorption of light by a material. It describes how the intensity of light absorbed by a material is directly proportional to the thickness of the material and the concentration of the absorbing substance.