Diamonds are cut in such a way that light entering them hits multiple facets from the inside at an angle greater than the critical angle (which is very low for diamond, around 24.4°). This results in multiple total internal reflections, trapping light and forcing it out of specific faces, creating a brilliant sparkle.
Explanation:
Rubber has no free electrons, high resistivity. Silver best conductor. Copper widely used conductor. Graphite conducts (non-metal). Insulators: glass, plastic, wood.
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