In this experiment, the known value of Planck's constant was calculated from experimental measurement using different colors of LEDs.
Procedure
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| Circuit was built similar to above scheme. |
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| Different LED light bulbs were used: yellow and blue |
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| Green and Red LED lights |
Data/Discussion
Summary
Since the white LED light appeared as multiple color bands on its spectrum, the white LED have a mixture of colors. The wavelength and voltage is inversely proportional to each other. The graph that plotted voltage vs. 1/wavelength gave the relationship of y = 2187.7x -1.341. The slope represents for hc/E.The percent error of this experiment is about 1.75%. This suggested that the experimental procedure is consistent, which resulted in accurate planck's constant, h.
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