Atom: Journey Across the Subatomic Cosmos by Isaac Asimov PDF

By Isaac Asimov

ISBN-10: 0525249907

ISBN-13: 9780525249900

The mythical Isaac Asimov begins what's might be the best of all his books with an easy question: How finely can a section of subject be divided? yet like many straightforward questions, this one leads readers on a far-flung quest for a last solution, a seek that encompasses such attention-grabbing phenomena as mild and electrical energy and their components--strange yet genuine bits of topic that problem our assumptions in regards to the very nature of time and house. forty illustrations.

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Extra info for Atom: Journey Across the Subatomic Cosmos

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The temperature rose steadily as one progressed away from the violet, and reached its high­ est point at the extreme red. Astonished, Herschel won47 Atom dered what would happen if he placed the thermometer bulb beyond the red. He found, to his even greater aston­ ishment, that the temperature rose to a higher figure there than anywhere in the visible spectrum. Herschel thought he had detected heat waves. In a few years, however, the wave theory of light was established and a better interpretation became possible.

Thus, the Moon is sixty times as far from the Earth's center as the Earth's surface is. The Earth's gravitational 37 1 1. awl 2. An unmagnetized iron needle will be attmcted to either the north or the south pole of a magnet. Once magnetized, however, one ewl will be repelled, while the other will attmct. 3. Unlike poles (N, S) attmct. 4. Like poles (N, N or S, S) repel. pull at the distance of the Moon is only 1/60 x 1/60, or 113600 of what it is on the Earth's surface. Nevertheless, this pull is proportional to the product of the two masses involved, and the Earth and Moon are so massive that the Earth's gravitational pull is still large enough at the distance of the Moon to hold the Moon in orbit.

When this is done, the filings arrange themselves in a group of curved lines ex­ tending from one pole of the magnet to the other. Pere39 Atom grinus had noticed this, and, in 1831, the English scientist Michael Faraday (1791-1867) considered the subject. To Faraday it seemed that the influence of the magnet stretched out through space in all directions in a magnetic field that weakened with distance according to the inverse square law. Through the field one could draw a vast number of lines (magnetic lines of force) that marked out regions where the strength of the magnetic field was the same.

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Atom: Journey Across the Subatomic Cosmos by Isaac Asimov

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