Annual Report of the Board of Regents of the Smithsonian InstitutionThe Institution, 1921 |
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Сторінка 199
... atom , whether a helium atom or an electron , is shot out with great speed . In order to produce a- , - , or y - rays of equal energy to those emitted by radioactive sub- stances , potential differences of about 2,000,000 volts applied ...
... atom , whether a helium atom or an electron , is shot out with great speed . In order to produce a- , - , or y - rays of equal energy to those emitted by radioactive sub- stances , potential differences of about 2,000,000 volts applied ...
Сторінка 201
... atom itself , and numerous types of model atoms have been proposed . The great difficulty in these attempts is the uncertainty of the relative importance of the rôle played by positive and negative electricity . In the model atom ...
... atom itself , and numerous types of model atoms have been proposed . The great difficulty in these attempts is the uncertainty of the relative importance of the rôle played by positive and negative electricity . In the model atom ...
Сторінка 541
... atom has contradicted its etymology and disowned its name ? Who doubts that the atom of radium disintegrates spontaneously and that the emanation and helium are the products of this disintegration ? Who doubts that there is a complete ...
... atom has contradicted its etymology and disowned its name ? Who doubts that the atom of radium disintegrates spontaneously and that the emanation and helium are the products of this disintegration ? Who doubts that there is a complete ...
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Bureau of American Ethnology | 17 |
Report on the United States National Museum | 25 |
EXECUTIVE COMMITTEE AND REGENTS | 100 |
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