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Bookmark or Share- Lightning | Voltage, Causes, & Facts | BritannicaWhen the junction is complete, the cloud is effectively connected to the ground, and a very bright return stroke propagates back to the cloud at a speed about one-third the speed of light, following the leader channel. A typical lightning flash to the ground contains three or four leader-return stroke sequences in rapid succession.
- Light | Definition, Properties, Physics, Characteristics, Types ...Light from the Sun warms the Earth, drives global weather patterns, and initiates the life-sustaining process of photosynthesis; about 10 22 joules of solar radiant energy reach Earth each day. Light’s interactions with matter have also helped shape the structure of the universe.
- light - Kids | Britannica Kids | Homework HelpLight waves travel through space at a speed of about 186,282 miles per second (299,792 kilometers per second). Scientists use an idea called wavelength to describe light waves. Like waves moving across a pool of water, light waves have peaks and valleys.
- Light and its properties | Britannicalight, That portion of the electromagnetic spectrum visible to the human eye. It ranges from the red end to the violet end of the spectrum, with wavelengths from 700 to 400 nanometres and frequencies from 4.3 × 10 14 to 7.5 × 10 14 Hz.
- The science behind striking a match - Encyclopedia BritannicaThis oxygen combines with antimony trisulfide to produce a long-lasting flame so you have enough time to light a candle. The whole thing is coated with paraffin wax, which helps the flame travel down the match.
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