By Colin Cooke
Figuring out, designing and engaging in experiments is on the middle of technology. this article introduces the elemental rules on which physicists should still construct a radical experimental method of their discipline.
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Extra resources for An introduction to experimental physics
8. Perform the final experiment The work was concluded in August 1916, having occupied the better part of two years. 9. Millikan, Philosophical Magazine 34, 1, 1917. There had been other reports on earlier parts of the work but this is the final one. 4 —the Mpemba effect This is a very different example from the pioneering work of Millikan, but is included to illustrate the importance of a questioning attitude to science and the complexity of an apparently simple phenomenon. The problem is posed thus: given two containers of water, alike in every respect except that one is at a higher temperature than the other, which will freeze the faster if placed into the same freezer?
The choice of Vmax is probably the most contentious decision made in the photoelectric experiment, and suggesting the next student considers other possibilities could be helpful to both of you. Perhaps the least satisfactory aspect of this experiment lies in the criterion used to choose the value of Vmax from the measured data. A simple approach was made here, and though it yielded results that were acceptable, it would be worthwhile investigating other possibilities. Another improvement may be achieved by concentrating only on those values of the current close to zero, as there is little useful information at larger values.
Another boy, who had bought some milk for making ice-cream, ran to the refrigerator when he saw me boiling up milk and quickly mixed his milk with sugar and poured it into the ice tray without boiling it, so that he may not miss his chance. Knowing that if I waited for the boiled milk to cool before placing it in the refrigerator I would lose the last available ice-tray, I decided to risk ruin to the refrigerator on that day by putting hot milk into it. The other boy and I went back an hour and a half later and found that my tray of milk had frozen into ice-cream while his was still only a thick liquid, not yet frozen.
An introduction to experimental physics by Colin Cooke