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By Colin Cooke

Figuring out, designing and engaging in experiments is on the center of technology. this article introduces the elemental ideas on which physicists may still construct a radical experimental method of their discipline.

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realizing, designing and accomplishing experiments is on the middle of technological know-how. this article introduces the elemental rules on which physicists may still construct a radical experimental method to Read more...

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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. 034 eV The unit of A is not SI, but is the one in common usage. This value cannot be checked since it depends on the composition and structure of the photocathode surface, which is not known.

6. Analyze the preliminary measurements This section might have been included under the previous one, since there is little point in making preliminary measurements if you do not analyze them. But part of your design strategy will have included the method of analysis of the data, and it is worth considering at this stage whether your original choice was the best one. Chapter 5 discusses some of the methods available. 7. Redesign the experiment, if necessary After steps 5 and 6 you should be able to decide whether the aims of the experiment are likely to be reached when the final measurements are made.

These were performed to discover which range of the electrometer to use with each filter; it was not thought desirable to change the range during a run with a particular filter as the meter calibration might change. Then the stability of a given reading was established over a timescale (about 5 min) similar to that used for a series of measurements with one filter. 1 V steps, the current, I, was read for each filter in turn. To reduce the possibility of drift in the apparatus, the measurements with all six filters were taken in the shortest time consistent with accuracy.

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