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Now includes TRIAGE IN A DISASTER. THIS EXAM INCLUDES SOME PARTS ALL OF THE QUIZZES I OFFER BUT YOU MAY PURCHASE SEPARATELY IF DESIRED. Jump to navigation Jump to search “Lightspeed” redirects here. The distance from the Sun to the Earth is shown as 150 million kilometers, an approximate average.

Earth to the edge of the observable universe46. For example, for visible light the refractive index of glass is typically around 1. For many practical purposes, light and other electromagnetic waves will appear to propagate instantaneously, but for long distances and very sensitive measurements, their finite speed has noticeable effects. In communicating with distant space probes, it can take minutes to hours for a message to get from Earth to the spacecraft, or vice versa. Historically, the symbol V was used as an alternative symbol for the speed of light, introduced by James Clerk Maxwell in 1865. 0 for the speed of light in vacuum.

1 does not affect the result. 1 when v equals zero and stays nearly constant for small v’s, then it sharply curves upwards and has a vertical asymptote, diverging to positive infinity as v approaches c. The Lorentz factor γ as a function of velocity. It starts at 1 and approaches infinity as v approaches c. Special relativity has many counterintuitive and experimentally verified implications. The difference of γ from 1 is negligible for speeds much slower than c, such as most everyday speeds—in which case special relativity is closely approximated by Galilean relativity—but it increases at relativistic speeds and diverges to infinity as v approaches c. It is generally assumed that fundamental constants such as c have the same value throughout spacetime, meaning that they do not depend on location and do not vary with time.