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#: 271 - 280

# Nome
Anno
Paese
Scienza
Realizzazioni
271 Edwin_H._Hall_1388.jpg
Edwin H. Hall

1855-1938
Stati Uniti d'America
Fisica

discovered the ``Hall effect,''
272 Heike_Kamerlingh-Onnes_1395.jpg
Heike Kamerlingh-Onnes

1853-1926
Paesi Bassi
Fisica

liquified helium; discovered superconductivity
273 Sir_William_Henry_Bragg_1397.jpg
Sir William Henry Bragg

1862-1942
Regno Unito
Fisica

worked on x-ray spectrometry
274 Philipp_von_Lenard_1398.jpg
Philipp von Lenard

1862-1947
Germania
Fisica

studied cathode rays and the photoelectric effect
275 Robert_Millikan_1399.jpg
Robert Millikan

1868-1953
Stati Uniti d'America
Fisica

measured the charge of an electron; introduced term ``cosmic rays'' for the radiation coming from outer space; studied the photoelectric effect
276 Sir_Owen_Richardson_1402.jpg
Owen Willans Richardson

1879-1959
Regno Unito
Fisica

discovered the basic law of thermionic emission, now called the Richardson (or Richardson-Dushman) equation, which describes the emission of electrons from a heated conductor
277 Clinton_Joseph_Davisson_1403.jpg
Clinton Joseph Davisson

1881-1958
Stati Uniti d'America
Fisica

co-discovered electron diffraction
278 Victor_Franz_Hess_1404.jpg
Victor Franz Hess

1883-1964
Austria
Fisica

discovered cosmic radiation
279 Peter_Debye_1405.jpg
Peter Debye

1884-1966
Paesi Bassi
Fisica, Chimica

used methods of statistical mechanics to calculate equilibrium properties of solids; contributed to knowledge of molecular structure
280 Karl_Manne_Georg_Siegbahn_1406.jpg
Karl Manne Georg Siegbahn

1886-1978
Svezia
Fisica

made important experimental contributions to the field of x-ray spectroscopy

Ultimo aggiornamento: 2018-11-13

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