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...e decay|radioactivity]] (''A''). 1 Bq is defined as the [[Frequency|number of times]] a [[Atomic nucleus|nucleus]] decays every [[second]]. ...how fast]] radioactive decay occurs over time, which depends on the nature of the radioactive sample, particularly the constituent [[isotopes]].<ref name ...

'''Time''' is the never-ending continued [[sequence|proсess]] of [[existence]] and [[event]]s. It happens in an apparently irreversible way ...e are the phases of the [[moon]] (as it orbits the Earth), and the seasons of the [[year]] (as the Earth orbits the [[Sun]]). ...

A '''minute''' is a customary unit of [[time]]. It is equal to 60 [[second]]s. There are 60 minutes in an [[hour]]. Unli ...th>'</math> symbol.<ref>{{Cite web|last=|first=|date=2020-04-17|title=List of Geometry and Trigonometry Symbols|url=https://mathvault.ca/hub/higher-math/ ...

...length smaller than this is used in any measurement, then it has a chance of being wrong due to quantum uncertainty.<ref>{{Cite web|url=https://www.phys ...nt length for [[quantum gravity]] because it may be approximately the size of the smallest [[Black hole|black holes]].<ref>{{Cite web|url=http://math.ucr ...

...ww.ibtimes.com/physicists-witness-electron-escaping-atom-smallest-fragment-time-ever-observed-2445628|archive-url=|archive-date=|website=IBT Times|publishe ...Planck time is the time it would take a [[photon]] travelling at the speed of light to cross a distance equal to one [[Planck length]]. ...

...nry_joseph.html | url-status = dead }}</ref> The [[magnetic permeability]] of a complete [[vacuum]] is 4π×10⁻⁷ H/m (henry per meter). ...stitute of Standards and Technology]] provides guidance for American users of SI to write the plural as henries. People do not capitalize unit names.<!-- ...

[[File:World line.svg|thumb|Example of a light cone.]] ..., z) and one dimension of time. Minkowski spacetime has a metric signature of (-+++), and describes a flat surface when no mass is present. The conventio ...

...e change of velocity [[Division (mathematics)|divided]] by the change of [[time]]. Acceleration is a [[vector]], and therefore includes both a [[size]] and # Time is how long it took you to travel ...

...[[vacuum]] during a [[time]] interval of <math>\frac{1}{299792458}</math> of a [[second]]. ...he length of a meter, but a square kilometer is one million times the area of a square meter. ...

...ans something is turning very fast. The angular frequency is the magnitude of the vector quantity angular velocity which is also known as angular frequen [[Image:Angularvelocity.svg|thumb|294px|Angular frequency is a measure of how fast an object is rotating. The <math>d\theta</math> in the diagram sh ...

...matic drawing of "intensity". (Average energy or volume delivered per unit time per unit area.)]] ...t have an intensity of 100 buckets of [[water]] per minute per open window of a certain size in a burning building. ...

...rse is, by definition, homogeneous). The [[Clock|clocks]] measuring cosmic time should move along the [[Hubble flow]]. ...ke something better to the comoving coordinates) is blind to the expansion of the universe. ...

...eration, e.g. 9.81 ms^-2. Weight is sometimes called the ''force of gravity''. The mass of an object is measurable when a [[force]] is exerted on the object. If the m ...

This is used in a technique of [[absorption spectroscopy]] known as '''ultraviolet-visible spectroscopy''' ...ption are from about 200 nanometers to 800 nanometers. This is a section of the [[electromagnetic spectrum]] pictured.<ref>Visbile and Ultraviolet Spec ...

{{redirect|Kilo|unit of mass|Kilogram}} ...e]]), [[candela]] ([[luminous intensity]]), [[Mole (unit)|mole]] ([[amount of substance]]) and [[kilogram]] ([[mass]]). ]] ...

...tion (chemistry)|reduction]] [[Potential energy|potential]] or [[voltage]] of an [[Electrochemistry|electrochemical]] cell. It is widely used in cell [[p This equation can be used to check which combination of [[Chemical substance|chemicals]] will be suitable to construct a powerful e ...

...svg|thumb|180px|[[Refraction]] of light at the interface between two media of different [[refractive index|refractive indices]], with n₂ > n<s [[File:Fénytörés.jpg|thumb|A ray of light hits a glass prism and is refracted]] ...

...;10⁶ seconds = 15.9735 days – [[Half-life (element)|half life]] of [[vanadium]]-48 *1.54&times;10⁶ seconds = 17.81 days – half life of [[californium]]-253 ...

...ve a lot of mathematical problems, they cannot be represented by an amount of real life objects. ...ss]] would prove that imaginary numbers were very important for some areas of [[algebra]]. ...

...n. Because the flywheel resists changes in speed, it decreases the effects of uneven torque. [[Engine]]s which use [[piston]]s to provide power usually h ...rse, you wouldn't want to lug a heavy wheel around on a bus, so it is made of a lighter material that can withstand extremely fast rotation. ...