momentum
http://plus.maths.org/content/taxonomy/term/243
enLight's identity crisis
http://plus.maths.org/content/lights-identity-crisis
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Peter Landshoff </div>
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<img class="imagefield imagefield-field_abs_img" width="109" height="110" alt="" src="http://plus.maths.org/content/sites/plus.maths.org/files/issue5/qm2/icon.jpg?893977200" /> </div>
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What is light? Sometimes it seems wave-like and sometimes particle like. See how Einstein applied his theory of relativity to the problem, predicted that photons have no mass and laid the foundations for quantum mechanics. </div>
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<div class="pub_date">May 1998</div>
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<p>A moving charged particle, such as an electron, experiences electric and magnetic forces. In the middle of the 19th century, the Scottish physicist James Clerk Maxwell wrote down a set of equations which unified these two forces into a single theory. This led him to understand light waves (and radio waves) as electromagnetic oscillations propagating through a vacuum.</p><p><a href="http://plus.maths.org/content/lights-identity-crisis" target="_blank">read more</a></p>http://plus.maths.org/content/lights-identity-crisis#comments5diffractionelectromagnetismenergymomentumphoto-electric effectwave-particle dualityThu, 30 Apr 1998 23:00:00 +0000plusadmin2141 at http://plus.maths.org/content