By Colin Cooke
Knowing, designing and engaging in experiments is on the center of technology. this article introduces the basic rules on which physicists may still construct a radical experimental method of their self-discipline.
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Extra info for An Introduction to Experimental Physics
In spite of all attempts to prevent light reaching the anode, some electrons were emitted from it, yielding a negative current that was evident when the voltage was large enough. e. when the cathode current, I, was just zero. The simple view taken here was to choose the value of V when the current was zero. 8. 4 Vmax for different wavelengths and the weighted least squares fit analysis. 2 1. 8 Vmax versus 1/λ: weighted least squares fit (CG, centre of gravity). Since the difference is only a little more than 2 errors in magnitude the agreement between theory and experiment is reasonable.
Steps along the way We will start with a list of the necessary steps, discuss each in general terms, and then apply the ideas to particular experiments: 30 DESIGN OF EXPERIMENTS 1. Choose a subject suitable for an experiment. 2. Discover what is known about it. 3. Have you the necessary facilities? 4. Design the experiment. 5. Make preliminary measurements. 6. Analyze the preliminary results. 7. Redesign the experiment if necessary. 8. Perform the experiment. 9. Write a scientific report. General discussion 1.
These will propagate into an error in rs, which I will call . The most accurate measurement will be achieved when we divide our time between the two measurements in such a way as to produce a minimum for . e. (10) This seems to require the answer to the measurements (rb/rs+b) before we can decide the best conditions for making them! The apparent illogicality can be avoided with a quick preliminary measurement, lasting perhaps a few minutes, to find an approximate value for rb/rs+b before starting the final measurements lasting a few hours, say.