Frases de François Arago

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François Arago

Data de nascimento: 26. Fevereiro 1786
Data de falecimento: 2. Outubro 1853

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François Jean Dominique Arago foi um físico, astrônomo e político francês.

Ocupou o cargo de primeiro-ministro da França, de 10 de maio a 24 de junho de 1848.

Ver a biografia de seu irmão Jacques Arago, explorador, que esteve no Brasil.

Deve-se às investigações de Arago a confirmação da teoria ondulatória da luz

Dominique François Jean Arago iniciou seus estudos em Perpignan, seguindo depois para Paris, onde frequentou a École Polytechnique. Aos 19 anos foi nomeado secretário do Observatório de Paris e, logo depois, junto com o físico e astrônomo Jean-Baptiste Biot, completou a medida de um arco do meridiano terrestre.

No ano de 1809 Arago foi eleito para a Académie des Sciences, assumindo no mesmo ano o cargo de professor de geometria analítica na École Polytechnique. De 1809 a 1830, dedicou-se exclusivamente à ciência.

Em 1830 ingressou na política, como deputado republicano. Em 1848 foi nomeado ministro da Marinha.

Luz e eletromagnetismo

Dos trabalhos de Arago no domínio da física ressaltam, por sua importância, as descobertas da polarização cromática da luz e a polarização rotatória. Em 1811, trabalhando com Augustin Jean Fresnel, descobriu um novo processo de decompor a luz branca.

As investigações de Arago e Fresnel sobre os fenômenos de polarização vieram confirmar a teoria ondulatória da luz.

Importante, também, foi a contribuição de Arago para o progresso dos estudos dos fenômenos eletromagnéticos. As obras completas de Arago foram publicadas, de 1854 a 1862, em 13 volumes.

Citações François Arago

„I was often humiliated to see men disputing for a piece of bread, just as animals might have done.“

— François Arago
Context: I was often humiliated to see men disputing for a piece of bread, just as animals might have done. My feelings on this subject have very much altered since I have been personally exposed to the tortures of hunger. I have discovered, in fact, that a man, whatever may have been his origin, his education, and his habits, is governed, under certain circumstances, much more by his stomach than by his intelligence and his heart. "The History of My Youth", p. 55.

„The lapse of ages has not rendered us wiser in this respect. In our own time the public delight in blending fable with history.“

— François Arago
Context: The ancients had a taste, let us say rather a passion, for the marvellous, which caused them to forget even the sacred duties of gratitude. Observe them, for example, grouping together the lofty deeds of a great number of heroes, whose names they have not even deigned to preserve, and investing the single personage of Hercules with them. The lapse of ages has not rendered us wiser in this respect. In our own time the public delight in blending fable with history. In every career of life, in the pursuit of science especially, they enjoy a pleasure in creating Herculeses. Joseph Fourier, p. 408.

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„I have discovered, in fact, that a man, whatever may have been his origin, his education, and his habits, is governed, under certain circumstances, much more by his stomach than by his intelligence and his heart.“

— François Arago
Context: I was often humiliated to see men disputing for a piece of bread, just as animals might have done. My feelings on this subject have very much altered since I have been personally exposed to the tortures of hunger. I have discovered, in fact, that a man, whatever may have been his origin, his education, and his habits, is governed, under certain circumstances, much more by his stomach than by his intelligence and his heart. "The History of My Youth", p. 55.