出版社：Instituto Politécnico Nacional, Latin American Physics Education Network
摘要：AbstractDetailed discussions are presented on the determination of Planck’s constant from the Planck radiation law. Thelaboratory setup consists of a low cost lamp and a photodiode such that a light filter of known wavelength isinterposed between the two pieces of apparatus. The lamp filament is the approximate blackbody of which radiation isgoverned by the Planck’s law of radiation. For the purposes of didactics, it is explained that laboratory precautions willenable accurate data. However, if the governing equation is subjected to spurious approximations, errors will beinevitable in the computation. This was the situation before. Now, when the setup is in operation, a phenomenon ofresistance-temperature filter effect is observed. Data collected have been subjected to interesting analyses, which canbe used to introduce students into numerical experiments. Usually, a pair of intensity values calculated from theobserved phenomenon, would be required. Ratio of the intensities is then used in the exact Planck’s radiationequations leading to a transcendental exponential equation. Solutions of this equation subsume the precise value of thePlank’s constant.
