Read e-book online A scientist at the seashore PDF

By James Trefil

ISBN-10: 048644564X

ISBN-13: 9780486445649

''A very good expedition from the seashore to the ends of the sun approach . . . captivating.''—The big apple Times
''So effortless to appreciate but so dense with wisdom that you will by no means examine waves on a seashore an identical approach again.''—San Francisco Chronicle
''One of the easiest well known technological know-how books.''—The Kansas urban Star
''Perfect for the weekend scientist.''—The Richmond News-Leader
A famous physicist and well known technological know-how author heads for the seashore to reply to universal and unusual questions about the sea. James S. Trefil, writer of Dover courses' The second of construction: massive Bang Physics from sooner than the 1st Millisecond to the current Universe, explains why the ocean is salty, how bubbles shape at the water's floor, the place waves come from, and different curiosities of the marine international. Dr. Trefil attracts upon his special present for clarifying complicated clinical ideas and the theories at the back of them to give a story that's transparent, available, and totally compelling.

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It does not say that a very precise measurement of one variable necessarily rattles the other in an uncontrollable manner. One of the objections raised against the instantaneous collapse of the wave function is that the latter usually extends and differs from zero all over space. How can it instantly change everywhere to a new form? But clearly this is based on a misinterpretation of its meaning. It would be a valid objection if the wave function were what Schrödinger originally intended, analogous to an electromagnetic field, or if it directly described reality so that its collapse implied an instantaneous change of the system itself everywhere.

Characteristic (a) implies that neither [⋅ G, G ⋅] nor [G ⋅, ⋅ G] was ever sent; (b) implies that the message [R ⋅, R ⋅] was never sent either. However, the result 2G2G, which did occur 37 How Physics Confronts Reality according to (c) could be brought about only by one of the four messages of the form [⋅ G, ⋅ G]: the messages [GG, RG], [RG, GG], and [GG, GG] would produce results contradicting (a), and the message [RG, RG] would result in a contradiction with (b). We therefore have to conclude that these results could not have been produced by ordinary classical signals.

Einstein was unwilling to accept this categorical judgment. For several years after the publication of Heisenberg’s paper, he took every opportunity at scientific meetings attended by both Bohr and himself to use ingenious thought experiments to show how he could measure both the position and the momentum of a particle as accurately as the measuring apparatus allowed. Contrary to Heisenberg’s original argument involving his “gamma-ray microscope,’’ intended to show how the precise measurement of one variable necessarily uncontrollably disturbed the other, he attempted to find ways of measuring both with unlimited accuracy.

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A scientist at the seashore by James Trefil


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