Occasionally, when there is a strike to a mountain or tall building, the first leader will start at the ground and propagate upward. A typical lightning flash to the ground contains three or four leader-return stroke sequences in rapid succession. When 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. ![]() When the stepped leader nears the ground, an upward, connecting discharge of opposite polarity rises and meets it at a point typically about 30 metres (100 feet) above the ground. Most leader channels are negatively charged. The leader is highly branched in the direction of its propagation. Next, a stepped leader (initial lightning stroke) forms and propagates downward, following channels created by the preliminary breakdown process. All presented within a clean, clear, and colorful. Product Specification Material:ABS Power Source: Solar LEDSMD 2835 0. It includes powerful tools, intelligent views, and flexible workspaces. This process creates a channel of partially ionized air-air in which neutral atoms and molecules have been converted to electrically charged ones. Postbox is one of the best email client for macOS and Windows. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!Ĭloud-to-ground lightning is initiated by a preliminary breakdown process within the cloud, typically between the centre region of negative charge and the small positive charge below it.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more. ![]() This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives. ![]()
0 Comments
Leave a Reply. |