Einstein and the Universe; A Popular Exposition of the Famous Theory

Einstein and the Universe; A Popular Exposition of the Famous Theory

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ...of generations have been wont to call "matter." And from all this it also follows, by calcu lation and by the simple and elegant reason-, -ing of Einstein, of which I here convey only /.. the faintest adumbratign, that mass and en-, ergy are the same thing, or are at least tl1et_VV-i', All this irresistibly compels us to think that ) different sides of one and the same coin. There is, then, no longer a material mass. There is nothing but energy in the external universe. A strange--in a sense, an almost spiritual--turn for modern physics to takel According to all this the greater part of the "mass" of bodies must be due to a considerable and concealed internal energy. It is this energy which we find gradually dissipated in radio-active bodies, the only reservoirs of atomic energy which have as yet opened externally. If this is true, if energy and mass are synonymous, if mass is merely energy, it follows that free energy must possess the property of mass. As a matter of fact, light, for instance, has mass. Careful experiments have shown that when a ray of light strikes a material object, it exerts upon it a pressure which has been measured. Light has mass; therefore it has weight, like all masses. When we come to consider the new form given by Einstein to 31cents Problem of gravitation, we shall see a further and beautiful proof that light has weight. We can calculate that the light received from the sun by the earth in the space of a year is rather more than 58,000 tons. It seems-very little when one thinks of the formidable weight of coal that would be needed to maintain our globe at the temperature at which the sun keeps it--in the event of a sudden extinction of our luminary. The reason for the difference ishow more

Product details

  • Paperback | 46 pages
  • 189 x 246 x 3mm | 100g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236943244
  • 9781236943248