The Radioactive Substances: Their Properties and BehaviourK. Paul, Trench, Trübner & Company, Limited, 1908 - 301 pagini |
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Pagina 20
... metre cannot be directly counted , this quantity can be estimated by measuring the time taken for the cloud to fall . Since the individual drops of water in a cloud are exceedingly small , 20 THE RADIOACTIVE SUBSTANCES.
... metre cannot be directly counted , this quantity can be estimated by measuring the time taken for the cloud to fall . Since the individual drops of water in a cloud are exceedingly small , 20 THE RADIOACTIVE SUBSTANCES.
Pagina 21
... fall through a viscous fluid of density p , then the terminal velocity of the drop is given by the equation u = - ρ 2 Po 9 μ ga2 where μ is the coefficient of viscosity , g the acceleration due to gravity , and a the radius of the drop ...
... fall through a viscous fluid of density p , then the terminal velocity of the drop is given by the equation u = - ρ 2 Po 9 μ ga2 where μ is the coefficient of viscosity , g the acceleration due to gravity , and a the radius of the drop ...
Pagina 29
... fall is made sufficiently thin , the rays are able to penetrate the walls and can be detected outside . Thus when a piece of very thin aluminium was cemented over a hole in the discharge tube and the cathode rays allowed to fall upon it ...
... fall is made sufficiently thin , the rays are able to penetrate the walls and can be detected outside . Thus when a piece of very thin aluminium was cemented over a hole in the discharge tube and the cathode rays allowed to fall upon it ...
Pagina 31
... fall upon a metallic plate - pre- ferably of platinum - situated opposite the cathode . In these circumstances a beam of Röntgen rays is emitted from the plate , and after traversing the walls of the discharge . tube , pass out into the ...
... fall upon a metallic plate - pre- ferably of platinum - situated opposite the cathode . In these circumstances a beam of Röntgen rays is emitted from the plate , and after traversing the walls of the discharge . tube , pass out into the ...
Pagina 49
... fall upon screens of certain materials , such as zinc sulphide . Inspired by this important discovery of M. Becquerel , a search was made by several in- vestigators to find out whether any of the other chemical elements exhibited this ...
... fall upon screens of certain materials , such as zinc sulphide . Inspired by this important discovery of M. Becquerel , a search was made by several in- vestigators to find out whether any of the other chemical elements exhibited this ...
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Termeni și expresii frecvente
absorption actinium active deposit ALPHA RAYS aluminium atomic weight barium Becquerel bismuth Boltwood cathode rays centimetres charge carried charged particles chemical considered contained corpuscles crystals Curie and Danne deflected density detected discovery effect electric field electrolysis electrometer electroscope emana experiments exposed fact fluorescence formed Fourth Edition gases gramme of radium heat helium hydrogen Illustrations insulated ionization J. J. Thomson known light LL.D Madame Curie magnetic field matter measured metals method minerals nature negative ions negatively charged obtained passing phenomena Phil pitchblende polonium present pressure produced properties quantity of emanation quantity of radium radiation emitted radio radioactive bodies radioactive elements radioactive substances radium bromide radium chloride radium emanation radium salt rate of decay removed Röntgen rays Rutherford Rutherford and Soddy seen separated shown solution temperature thorium thorium emanation tion transformed tube uranium velocity vessel weight of radium wire