photo-electric effect
https://plus.maths.org/content/taxonomy/term/241
enWhy quantum mechanics?
https://plus.maths.org/content/why-quantum-mechanics
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Marianne Freiberger </div>
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<img class="imagefield imagefield-field_abs_img" width="100" height="100" alt="" src="https://plus.maths.org/content/sites/plus.maths.org/files/abstractpics/5/16_may_2016_-_1147/prism_icon.jpg?1463399279" /> </div>
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<p>Why did physicists at the beginning of the 20th century feel they needed a new — and strange — theory?</p>
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<p>Towards the end of the 19th century people thought that physics was
done and dusted. Elegant theories described all the
natural phenomena people had observed, and only minor details needed
tidying up. Over the next few decades, however, alarming cracks
started to open up in the theory. Observations showed that, when examined at a very small scale,
nature just didn't behave as people thought it should. Quantum mechanics
was developed to explain this newly emerging picture.<p><a href="https://plus.maths.org/content/why-quantum-mechanics" target="_blank">read more</a></p>https://plus.maths.org/content/why-quantum-mechanics#commentsFP-belowhistory of mathematicslightphoto-electric effectquantum mechanicsquantum physicsThu, 19 May 2016 12:58:27 +0000mf3446566 at https://plus.maths.org/contentLight's identity crisis
https://plus.maths.org/content/lights-identity-crisis
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Peter Landshoff </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="https://plus.maths.org/content/lights-identity-crisis" target="_blank">read more</a></p>https://plus.maths.org/content/lights-identity-crisis#comments5diffractionelectromagnetismenergymomentumphoto-electric effectwave-particle dualityThu, 30 Apr 1998 23:00:00 +0000plusadmin2141 at https://plus.maths.org/content