21 JUN 2012 by ideonexus
Physics VS Metaphysics
In the 1920s, there was a dinner at which the physicist Robert W. Wood was asked to respond to a toast ... "To physics and metaphysics." Now by metaphysics was meant something like philosophy—truths that you could get to just by thinking about them. Wood took a second, glanced about him, and answered along these lines: The physicist has an idea, he said. The more he thinks it through, the more sense it makes to him. He goes to the scientific literature, and the more he reads, the more promi...The key difference is experimentation.
20 JUN 2012 by ideonexus
The Danger of Measurement
Measurement has too often been the leitmotif of many investigations rather than the experimental examination of hypotheses. Mounds of data are collected, which are statistically decorous and methodologically unimpeachable, but conclusions are often trivial and rarely useful in decision making. This results from an overly rigorous control of an insignificant variable and a widespread deficiency in the framing of pertinent questions. Investigators seem to have settled for what is measurable ins...Is that it can replace testing hypotheses. We gather data instead of validating exactly what it is we'd like to know.
31 JAN 2012 by ideonexus
Stephen Chu's Pendulum High School Experiment
For the better part of my last semester at Garden City High, I constructed a physical pendulum and used it to make a 'precision' measurement of gravity. The years of experience building things taught me skills that were directly applicable to the construction of the pendulum. Twenty-five years later, I was to develop a refined version of this measurement using laser-cooled atoms in an atomic fountain interferometer.Folksonomies: experiment science fair
Folksonomies: experiment science fair
He used the pendulum to make a precise measurement of gravity, and the process would eventually inform his Nobel Prize winning work.
28 JAN 2012 by ideonexus
Electrons Cannot Simultaneously Have Position and Velocity
On careful examination the physicist finds that in the sense in which he uses language no meaning at all can be attached to a physical concept which cannot ultimately be described in terms of some sort of measurement. A body has position only in so far as its position can be measured; if a position cannot in principle be measured, the concept of position applied to the body is meaningless, or in other words, a position of the body does not exist. Hence if both the position and velocity of ele...If the characteristics cannot be measured, they do not exist; therefore, electrons cannot simultaneously have both position and velocity characteristics.