https://energyeducation.ca/wiki/index.php?action=history&feed=atom&title=Speed_of_light
Speed of light - Revision history
2026-08-12T21:51:11Z
Revision history for this page on the wiki
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https://energyeducation.ca/wiki/index.php?title=Speed_of_light&diff=55696&oldid=prev
Jmdonev: 1 revision imported
2026-07-02T20:55:29Z
<p>1 revision imported</p>
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Jmdonev
https://energyeducation.ca/wiki/index.php?title=Speed_of_light&diff=55695&oldid=prev
energy>Jmdonev at 20:52, 25 June 2026
2026-06-25T20:52:14Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 20:52, 25 June 2026</td>
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<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Done <del style="font-weight: bold; text-decoration: none;">2015</del>-<del style="font-weight: bold; text-decoration: none;">03</del>-<del style="font-weight: bold; text-decoration: none;">06</del>]] <del style="font-weight: bold; text-decoration: none;"> </del>[[<del style="font-weight: bold; text-decoration: none;">Category</del>: <del style="font-weight: bold; text-decoration: none;">Needs Citations</del>]] </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Done <ins style="font-weight: bold; text-decoration: none;">2026</ins>-<ins style="font-weight: bold; text-decoration: none;">07</ins>-<ins style="font-weight: bold; text-decoration: none;">01</ins>]]</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><onlyinclude>The '''speed of light''', almost always written as ''c'' (for celerity, an archaic term for swiftness of motion), is a <del style="font-weight: bold; text-decoration: none;">constant which </del>is a strange consequence of Einstein's theory of [http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/relcon.html relativity].<<del style="font-weight: bold; text-decoration: none;">/onlyinclude</del>> <del style="font-weight: bold; text-decoration: none;">[[Photon]]s </del>(<del style="font-weight: bold; text-decoration: none;">packets of [[light]]</del>) <del style="font-weight: bold; text-decoration: none;">always travel at the speed of light in a [</del>[<del style="font-weight: bold; text-decoration: none;">vacuum]</del>]. Einstein's theories also led to the rather surprising consequence that [[mass]] and [[energy]] are related by the speed of light in what has become the most famous equation in physics:</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>[[<ins style="font-weight: bold; text-decoration: none;">File</ins>:<ins style="font-weight: bold; text-decoration: none;">Speedoflight.jpg|thumb|The speed of light, c, is constant in a vacuum.</ins>]]</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><onlyinclude>The '''speed of light''', almost always written as ''c'' (for celerity, an archaic term for swiftness of motion), is <ins style="font-weight: bold; text-decoration: none;">the constant value for velocity of a [[photon]] (packets of [[light]]) in </ins>a <ins style="font-weight: bold; text-decoration: none;">[[vacuum]]. It </ins>is a strange consequence of Einstein's theory of [http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/relcon.html relativity] <ins style="font-weight: bold; text-decoration: none;">and has been measured to be 299 792 458 meters per second</ins>. <<ins style="font-weight: bold; text-decoration: none;">ref</ins>><ins style="font-weight: bold; text-decoration: none;">BIPM. </ins>(<ins style="font-weight: bold; text-decoration: none;">2006</ins>)<ins style="font-weight: bold; text-decoration: none;">. "The "explicit-constant" formulation", </ins>[<ins style="font-weight: bold; text-decoration: none;">Online</ins>]<ins style="font-weight: bold; text-decoration: none;">, Avaliable: https://web.archive.org/web/20140811195806/http://www.bipm.org/en/si/new_si/explicit_constant</ins>.<ins style="font-weight: bold; text-decoration: none;">html</ref> </onlyinclude> </ins>Einstein's theories also led to the rather surprising consequence that [[mass]] and [[energy]] are related by the speed of light in what has become the most famous equation in physics:</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><math> E = mc^{2} </math></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><math> E = mc^{2} </math></div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>*''m'' is mass (often a mass difference, for example in [[nuclear fission|nuclear reaction]]s)</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>*''m'' is mass (often a mass difference, for example in [[nuclear fission|nuclear reaction]]s)</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>*''c'' is the speed of light.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>*''c'' is the speed of light.</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Light travels extremely fast. But, on a galactic scale, light still takes a very long time to reach observers.</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"><html></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"><iframe width="560" height="315" src="https://www.youtube.com/embed/nQUwHdSAhmw" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe></ins></div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>To learn more about the speed of light and its strange effects please see [http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/relcon.html hyperphysics], for the equation <math> E = mc^{2} </math> specifically please see the hyperphysics article on [http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/releng.html#c1 relativity].</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>To learn more about the speed of light and its strange effects please see [http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/relcon.html hyperphysics], for the equation <math> E = mc^{2} </math> specifically please see the hyperphysics article on [http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/releng.html#c1 relativity].</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">==Mass Defect and Nuclear Decay==</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Mass defect is the difference between the measured and calculated mass of the nucleus. By Einstein's energy-mass equivalence equation, "missing" mass is accounted for by considering any mass converted into energy during the formation of the atom. This principle also exists in nuclear decay. There is a slight difference in mass before and after an isotope decays and any difference was simply converted into energy. This phenomenon proves especially useful because we can then harness this energy for electricity production, such as is done in [[nuclear power]] plants.</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">==For Further Reading==</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">For further information please see the related pages below:</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* [[Radioactivity]]</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* [[Energy]]</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* [[Isotope]]</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* [[Mass]]</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* Or explore a [[Special:Random|random page]]</ins></div></td></tr>
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energy>Jmdonev
https://energyeducation.ca/wiki/index.php?title=Speed_of_light&diff=9784&oldid=prev
Jmdonev at 16:47, 30 July 2020
2020-07-30T16:47:00Z
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</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l9">Line 9:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>*''c'' is the speed of light.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>*''c'' is the speed of light.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>To learn more about the speed of light and its strange effects please see [http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/relcon.html hyperphysics], for the equation <<del style="font-weight: bold; text-decoration: none;">m</del>> E = mc^{2} </<del style="font-weight: bold; text-decoration: none;">m</del>> specifically please see the hyperphysics article on [http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/releng.html#c1 relativity].</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>To learn more about the speed of light and its strange effects please see [http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/relcon.html hyperphysics], for the equation <<ins style="font-weight: bold; text-decoration: none;">math</ins>> E = mc^{2} </<ins style="font-weight: bold; text-decoration: none;">math</ins>> specifically please see the hyperphysics article on [http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/releng.html#c1 relativity].</div></td></tr>
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Jmdonev
https://energyeducation.ca/wiki/index.php?title=Speed_of_light&diff=9783&oldid=prev
Jmdonev at 16:46, 30 July 2020
2020-07-30T16:46:34Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 16:46, 30 July 2020</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l2">Line 2:</td>
<td colspan="2" class="diff-lineno">Line 2:</td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><onlyinclude>The '''speed of light''', almost always written as ''c'' (for celerity, an archaic term for swiftness of motion), is a constant which is a strange consequence of Einstein's theory of [http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/relcon.html relativity].</onlyinclude> [[Photon]]s (packets of [[light]]) always travel at the speed of light in a [[vacuum]]. Einstein's theories also led to the rather surprising consequence that [[mass]] and [[energy]] are related by the speed of light in what has become the most famous equation in physics:</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><onlyinclude>The '''speed of light''', almost always written as ''c'' (for celerity, an archaic term for swiftness of motion), is a constant which is a strange consequence of Einstein's theory of [http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/relcon.html relativity].</onlyinclude> [[Photon]]s (packets of [[light]]) always travel at the speed of light in a [[vacuum]]. Einstein's theories also led to the rather surprising consequence that [[mass]] and [[energy]] are related by the speed of light in what has become the most famous equation in physics:</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><<del style="font-weight: bold; text-decoration: none;">m</del>> E = mc^{2} </<del style="font-weight: bold; text-decoration: none;">m</del>></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><<ins style="font-weight: bold; text-decoration: none;">math</ins>> E = mc^{2} </<ins style="font-weight: bold; text-decoration: none;">math</ins>></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Where:</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Where:</div></td></tr>
</table>
Jmdonev
https://energyeducation.ca/wiki/index.php?title=Speed_of_light&diff=1686&oldid=prev
J.williams: 1 revision imported
2015-08-26T21:31:40Z
<p>1 revision imported</p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
<tr class="diff-title" lang="en">
<td colspan="1" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="1" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 21:31, 26 August 2015</td>
</tr><tr><td colspan="2" class="diff-notice" lang="en"><div class="mw-diff-empty">(No difference)</div>
</td></tr></table>
J.williams
https://energyeducation.ca/wiki/index.php?title=Speed_of_light&diff=1685&oldid=prev
Jhanania at 23:39, 17 August 2015
2015-08-17T23:39:29Z
<p></p>
<p><b>New page</b></p><div>[[Category:Done 2015-03-06]] [[Category: Needs Citations]] <br />
<onlyinclude>The '''speed of light''', almost always written as ''c'' (for celerity, an archaic term for swiftness of motion), is a constant which is a strange consequence of Einstein's theory of [http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/relcon.html relativity].</onlyinclude> [[Photon]]s (packets of [[light]]) always travel at the speed of light in a [[vacuum]]. Einstein's theories also led to the rather surprising consequence that [[mass]] and [[energy]] are related by the speed of light in what has become the most famous equation in physics:<br />
<br />
<m> E = mc^{2} </m><br />
<br />
Where:<br />
*''E'' is energy<br />
*''m'' is mass (often a mass difference, for example in [[nuclear fission|nuclear reaction]]s)<br />
*''c'' is the speed of light.<br />
<br />
To learn more about the speed of light and its strange effects please see [http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/relcon.html hyperphysics], for the equation <m> E = mc^{2} </m> specifically please see the hyperphysics article on [http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/releng.html#c1 relativity].<br />
[[Category:Uploaded]]</div>
Jhanania