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1911 in science
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==Physics== * April 8 – [[Heike Kamerlingh Onnes]] discovers the phenomenon of [[superconductivity]].<ref>He presents his findings on April 28. {{cite journal|author1=van Delft, Dirk|author2=Kes, Peter|title=The discovery of superconductivity|journal=[[Physics Today]]|volume=63|issue=9|pages=38–43|doi=10.1063/1.3490499|date=September 2010|bibcode=2010PhT....63i..38V|doi-access=free}}</ref> * June 24–30 – [[Domenico Pacini]] runs a series of measurements of underwater ionization in the [[Gulf of Genoa]], demonstrating that the radiation later recognised as [[cosmic rays]] cannot be originated by the Earth's crust. * October – The first [[Solvay Conference|Solvay Congress]] of physicists convenes. * [[Ernest Rutherford]] explains the [[Geiger–Marsden experiment]] and derives the Rutherford [[cross section (physics)|cross section]] by deducing the existence of a [[atom|compact atomic nucleus]] from [[Rutherford scattering|scattering experiments]]. He proposes the [[Rutherford model]] of the atom and demonstrates that [[J. J. Thomson]]'s [[plum pudding model]] is incorrect. * [[Charles Wilson (physicist)|Charles Wilson]] finishes a sophisticated [[cloud chamber]].
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