Science and Life: Aberdeen AddressesJ. Murray, 1920 - 229 páginas |
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Página 18
... radioactive disintegrations of the atom proceed in a long sequence of successive changes at characteristic rates . The primary parent - elements , uranium and thorium , each stand , as it were , at the head of a long genealogical table ...
... radioactive disintegrations of the atom proceed in a long sequence of successive changes at characteristic rates . The primary parent - elements , uranium and thorium , each stand , as it were , at the head of a long genealogical table ...
Página 19
... radioactivity which , though it is more intense , is more ephemeral . More ... uranium mineral is exceedingly minute , it is just possible to obtain enough ... thorium , which were well studied by chemists for a century , so feeble is ...
... radioactivity which , though it is more intense , is more ephemeral . More ... uranium mineral is exceedingly minute , it is just possible to obtain enough ... thorium , which were well studied by chemists for a century , so feeble is ...
Página 20
... radium , evolved in the average period of 2500 years , is in the case of uranium and thorium spread over a term of thousands of millions of years . The effects are small but enduring , and , almost imperceptible in themselves , come to ...
... radium , evolved in the average period of 2500 years , is in the case of uranium and thorium spread over a term of thousands of millions of years . The effects are small but enduring , and , almost imperceptible in themselves , come to ...
Página 21
... the earth amongst the most complex sorts of atoms known to the chemist . All heavy elements , presumably , if they could be transmuted artificially into lighter ones , would evolve E energy on the same scale as uranium , thorium and.
... the earth amongst the most complex sorts of atoms known to the chemist . All heavy elements , presumably , if they could be transmuted artificially into lighter ones , would evolve E energy on the same scale as uranium , thorium and.
Página 22
Aberdeen Addresses Frederick Soddy. energy on the same scale as uranium , thorium and radium . Such transmutations are still beyond the power of man to effect , but he would be a bold prophet who would declare for how long a time this ...
Aberdeen Addresses Frederick Soddy. energy on the same scale as uranium , thorium and radium . Such transmutations are still beyond the power of man to effect , but he would be a bold prophet who would declare for how long a time this ...
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Términos y frases comunes
a-particle actinium active ancient animal atomic number atomic weight B-ray bismuth branch British Science Guild Carnegie Trust cent century chemical character chemical elements chemist chemistry classical coal commercial education complete conception creative definite direct discovery disintegration electricity electrons emanation energy evolved existence expelled experimental external Faculty FREDERICK SODDY fundamental H. H. Asquith helium hitherto human ideals important inanimate universe investigation ionium isotopes J. J. Thomson knowledge known labour lead living material means mechanism ment million mind minerals modern nation nature original past Periodic Law periodic table philosophy physical pitchblende polonium practical present problem processes Professor progress pure quantity radio-elements radioactive change radium recognised regard religion scientific study Scotland Soddy spectroscopic spectrum spirit study and research subjects successive teaching technical or commercial thallium thought tion to-day transmutation truth ultimate University of Aberdeen uranium and thorium wealth whole