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The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour).
In fact, lightning can, and often does, strike the same place more than once. Lightning in a thunderstorm is more likely to strike objects and spots that are more prominent or conductive. For instance, lightning strikes the Empire State Building in New York City on average 23 times per year. [166] [167] [168]
Typical speed of the stepped leader of lightning (cf. return stroke below). [31] 445,000 1,600,000 995,000 0.0015 Max velocity of the remaining shell (mass about 0.1 mg) of an inertial confinement fusion capsule driven by the National Ignition Facility for the 'Bigfoot' capsule campaign. [32] Current fastest macroscopic human-made system ...
The longest known lightning events have been given world-record status by the World Meteorological Organization, or WMO, in a recently published study. Study: World-record lightning flash was ...
At 4.0 seconds flat to 60 mph, Lightning is a very appropriate name. For premium support please call: 800-290-4726 more ways to reach us
The most noticeable aspect of lightning and thunder is that the lightning is seen before the thunder is heard. This is a consequence of the speed of light being much greater than the speed of sound. The speed of sound in dry air is approximately 343 m/s (1,130 ft/s) or 1,236 km/h (768 mph) at 20 °C (68 °F; 293 K). [19]
About 25 million times a year, lightning strikes the United States, according to the National Weather Service. Approximately 300 people per year are hit, and of those about 30 will die — many ...
Lightning currents have a very fast rise time, on the order of 40 kA per microsecond. Hence, although lightning is a form of direct current, conductors of such currents exhibit marked skin effect as with an alternating current, causing most of the currents to flow through the outer surface of the conductor. [32]