Inverse square law - Revision history

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	[[File:Inverse_square_law.png\|350px\|thumbnail\|Figure 1: The inverse square law can be seen as the force spreading out over an ever increasing area. <ref>Borb [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons https://commons.wikimedia.org/wiki/File%3AInverse_square_law.svg accessed August 26th, 2017.</ref>]]		[[File:Inverse_square_law.png\|350px\|thumbnail\|Figure 1: The inverse square law can be seen as the force spreading out over an ever increasing area. <ref>Borb [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons https://commons.wikimedia.org/wiki/File%3AInverse_square_law.svg accessed August 26th, 2017.</ref>]]
	<onlyinclude>A number of physical properties (like the [[force]] between two [[charge]]s) get smaller as they get farther apart in a way that can be represented by an '''inverse square law'''. This means that the intensity of the property decreases in a particular way as the distance between interacting objects increases.</onlyinclude> Specifically, an inverse square law says that intensity equals the inverse of the square of the distance from the source. For example, the radiation exposure from a point source (with no shielding) gets smaller the farther away it is. If the source is 2x as far away, it's 1/4 as much exposure. If it's 10x farther away, the radiation exposure is 100x less.		<onlyinclude>A number of physical properties (like the [[force]] between two [[charge]]s) get smaller as they get farther apart in a way that can be represented by an '''inverse square law'''. This means that the intensity of the property decreases in a particular way as the distance between interacting objects increases.</onlyinclude> Specifically, an inverse square law says that intensity equals the inverse of the square of the distance from the source. For example, the radiation exposure from a point source (with no shielding) gets smaller the farther away it is. If the source is 2x as far away, it's 1/4 as much exposure. If it's 10x farther away, the radiation exposure is 100x less.
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			==For Further Reading==
			To learn about the other forces, please see the following pages:
			*[[Gravity]]
			*[[Strong nuclear force]]
			*[[Electromagnetic force]]
			*[[Weak force]]
			*Or explore a [[Special:Random\|random page]]

	==References==		==References==
	{{reflist}}		{{reflist}}
	[[Category:Uploaded]]		[[Category:Uploaded]]

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Jmdonev at 03:50, 27 August 2017

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	[[Category:Done ~~2015~~-01-15 ]]		[[Category:Done 2017-07-01]]
			[[File:Inverse_square_law.png\|350px\|thumbnail\|Figure 1: The inverse square law can be seen as the force spreading out over an ever increasing area. <ref>Borb [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons https://commons.wikimedia.org/wiki/File%3AInverse_square_law.svg accessed August 26th, 2017.</ref>]]
	<onlyinclude>A number of physical properties (like the [[force]] between two [[charge]]s) get smaller as they get farther apart in a way that can be represented by an '''inverse square law'''. This means that the intensity of the property decreases in a particular way as the distance between interacting objects increases.</onlyinclude> Specifically, an inverse square law says that intensity equals the inverse of the square of the distance from the source. For example, the radiation exposure from a point source (with no shielding) gets smaller the farther away it is. If the source is 2x as far away, it's 1/4 as much exposure. If it's 10x farther away, the radiation exposure is 100x less.		<onlyinclude>A number of physical properties (like the [[force]] between two [[charge]]s) get smaller as they get farther apart in a way that can be represented by an '''inverse square law'''. This means that the intensity of the property decreases in a particular way as the distance between interacting objects increases.</onlyinclude> Specifically, an inverse square law says that intensity equals the inverse of the square of the distance from the source. For example, the radiation exposure from a point source (with no shielding) gets smaller the farther away it is. If the source is 2x as far away, it's 1/4 as much exposure. If it's 10x farther away, the radiation exposure is 100x less.

	Inverse square laws always look something like this:		Inverse square laws always look something like this:
	<m>X \~~alpha~~ \frac{1}{d^{2}}</m>
	*<m>X</m> is the quantity or intensity (sound, light, electric field)		<center><math>X \propto \frac{1}{d^{2}}</math></center>
	*<m>d</m> is the distance from the centre (rather than the surface)
			*<math>X</math> is the quantity or intensity (sound, light, electric field)
			*<math>d</math> is the distance from the centre (rather than the surface)

	Some examples of the inverse square law are:		Some examples of the inverse square law are:

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J.williams at 16:54, 12 August 2015

2015-08-12T16:54:50Z

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[[Category:Done 2015-01-15 ]]
<onlyinclude>A number of physical properties (like the [[force]] between two [[charge]]s) get smaller as they get farther apart in a way that can be represented by an '''inverse square law'''. This means that the intensity of the property decreases in a particular way as the distance between interacting objects increases.</onlyinclude> Specifically, an inverse square law says that intensity equals the inverse of the square of the distance from the source. For example, the radiation exposure from a point source (with no shielding) gets smaller the farther away it is. If the source is 2x as far away, it's 1/4 as much exposure. If it's 10x farther away, the radiation exposure is 100x less.

Inverse square laws always look something like this:
<m>X \alpha \frac{1}{d^{2}}</m>
*<m>X</m> is the quantity or intensity (sound, light, electric field)
*<m>d</m> is the distance from the centre (rather than the surface)

Some examples of the inverse square law are:
* [http://hyperphysics.phy-astr.gsu.edu/hbase/forces/isq.html#isqg universal law of gravity]
* [http://hyperphysics.phy-astr.gsu.edu/hbase/forces/isq.html#isqe electric fields and forces]
* [http://hyperphysics.phy-astr.gsu.edu/hbase/vision/isql.html#c1 intensity of light]
* [http://hyperphysics.phy-astr.gsu.edu/hbase/forces/isq.html#c4 radiation from a source]
* [http://hyperphysics.phy-astr.gsu.edu/hbase/forces/isq.html#c4 intensity of sound] (although we hear sound on a logarithmic scale in [http://hyperphysics.phy-astr.gsu.edu/hbase/sound/db.html#c1 decibels])

[http://hyperphysics.phy-astr.gsu.edu/hbase/forces/isq.html Hyperphysics] explores this idea further. The famous physicist [http://www.nobelprize.org/nobel_prizes/physics/laureates/1965/feynman-facts.html Richard Feynman] came up with an illustration of why intensities drop as the square of the distance by imagining buttering bread using a "butter gun." Roger Linsell created a non-imaginary butter gun and then created a video of this butter gun explaining the inverse square law:<ref> Permission given in private communication to embed Roger Linsell's video</ref>

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==References==
{{reflist}}
[[Category:Uploaded]]