The force between two electric charges is related to Coulomb’s law. This law describes how the electric force between two charged objects depends on the amount of charge on each object and the distance between them. Coulomb’s law is fundamental ...
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The entire charge of a charged conductor remains on its outer surface. This occurs because like charges repel each other and move as far apart as possible, resulting in the charges spreading out evenly on the outer surface of the ...
When a glass rod is rubbed with silk, the rod becomes positively charged. This occurs because electrons are transferred from the glass rod to the silk, leaving the rod with a deficiency of electrons and thus a positive charge.
Light travels slower in glass than in air because the refractive index of air is less than the refractive index of glass. The higher refractive index of glass indicates that light interacts more with the glass material, causing it to ...
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.
A cylindrical lens is used to correct the defect of astigmatism. This lens has different curvatures in different meridians, allowing it to compensate for the uneven curvature of the cornea or lens of the eye, thereby improving vision for astigmatic ...
To an astronaut in outer space, the sky appears black. This is because there is no atmosphere to scatter sunlight and create the blue sky effect seen from Earth. Instead, the darkness of space dominates the visual field, punctuated by ...
The photoelectric effect confirms the particle nature of radiation. It demonstrates that light can behave as discrete particles (photons), where each photon carries a specific amount of energy that can eject electrons from a material, a phenomenon inconsistent with wave ...