Objective: Verify that intensity of radiation is proportional to the fourth power of the temperature, T4
The way that intensity of radiation from a black body depends on temperature is described by the
Stefan-Boltzmann law. Similar dependence on temperature is exhibited by the intensity of radiation
from an incandescent lamp with a tungsten filament. In this experiment, a Moll thermopile is used to
make a relative measurement which verifies the law. The temperature of the filament can be determined
from the way its resistance depends on temperature, which can be determined very accurately
using a four-wire method.
![Experiment: Stefan-Boltzmann law (230 V, 50/60 Hz), 8000693 [UE4050200-230], Intensity of Radiation](/imagelibrary/UE4050200-230/UE4050200-230_01_Experiment-Stefan-Boltzmann-law-230-V-5060-Hz.jpg)
![Experiment: Stefan-Boltzmann law (230 V, 50/60 Hz), 8000693 [UE4050200-230], Intensity of Radiation](/thumblibrary/UE4050200-230/UE4050200-230_01_1200_1200_Experiment-Stefan-Boltzmann-law-230-V-5060-Hz.jpg)
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![Barrel Foot, 1 kg, 1002834 [U13265], Bases](/thumblibrary/U13265/U13265_01_140_140_Barrel-Foot-1-kg.jpg)
![Thermopile, 1000824 [U8441301], Greenhouse Effect](/thumblibrary/U8441301/U8441301_01_140_140_Thermopile.jpg)
![Stefan Boltzmann lamp, 1008523 [U8490050], Optical Lamps on Stem](/thumblibrary/U8490050/U8490050_01_140_140_Stefan-Boltzmann-lamp.jpg)
![DC Power Supply 20 V, 5 A (230 V, 50/60 Hz), 1003312 [U33020-230], Power Supplies](/thumblibrary/U33020-230/U33020-230_01_140_140_DC-Power-Supply-20-V-5-A-230-V-5060-Hz.jpg)
![Digital Multimeter P1035, 1002781 [U11806], Hand-held Digital Measuring Instruments](/thumblibrary/U11806/U11806_01_140_140_Digital-Multimeter-P1035.jpg)
![HF Patch Cord, 1m, 1002746 [U11255], Experiment Leads and Cables](/thumblibrary/U11255/U11255_01_140_140_HF-Patch-Cord-1m.jpg)
![HF Patch Cord, BNC/4 mm Plug, 1002748 [U11257], Experiment Leads and Cables](/thumblibrary/U11257/U11257_01_140_140_HF-Patch-Cord-BNC4-mm-Plug.jpg)
![Tube Holder S -
for the experimental setup of tubes of series S, 1014525 [U185002], Electron Tubes S](/thumblibrary/U185002/U185002_01_140_140_Tube-Holder-S-for-the-experimental-setup-of-tubes-of-series-S.jpg)
![High Voltage Power Supply 5 kV (230 V, 50/60 Hz), 1003310 [U33010-230], Power Supplies](/thumblibrary/U33010-230/U33010-230_01_140_140_High-Voltage-Power-Supply-5-kV-230-V-5060-Hz.jpg)
![Heat Equivalent Apparatus, 1002658 [U10365], Equivalent of Heat](/thumblibrary/U10365/U10365_01_140_140_Heat-Equivalent-Apparatus.jpg)
![Pair of Safety Experiment Leads, 75 cm, blue, red, 1017718 [U13816], Experiment Leads and Cables](/thumblibrary/U13816/U13816_01_140_140_Pair-of-Safety-Experiment-Leads-75-cm-blue-red.jpg)
![Helmholtz Coils S, 1000611 [U185051], Electron Tubes S](/thumblibrary/U185051/U185051_01_140_140_Helmholtz-Coils-S.jpg)
![Electron Diffraction Tube S, 1013889 [U185711], Electron Tubes S](/thumblibrary/U185711/U185711_01_140_140_Electron-Diffraction-Tube-S.jpg)
![Deflection Tube D, 1000651 [U19155], Electron Tubes D](/thumblibrary/U19155/U19155_01_140_140_Deflection-Tube-D.jpg)
![Millikan’s Apparatus (230 V, 50/60 Hz), 1018884 [U207001-230], Millikan’s Experiment](/thumblibrary/U207001-230/U207001-230_01_140_140_Millikan-s-Apparatus-230-V-5060-Hz.jpg)
![Measurement Amplifier U (230 V, 50/60 Hz), 1020742 [U8557560-230], Measuring Amplifier](/thumblibrary/U8557560-230/U8557560-230_01_140_140_Measurement-Amplifier-U-230-V-5060-Hz.jpg)
![Experiment: Increase of Internal Energy by Mechanical Work, 8000586 [UE2030300], Internal Energy](/thumblibrary/UE2030300/UE2030300_01_140_140_Experiment-Increase-of-Internal-Energy-by-Mechanical-Work.jpg)
![Experiment: Thomson Tube (230 V, 50/60 Hz), 8000666 [UE3070500-230], Experiments with Electron Tubes](/thumblibrary/UE3070500-230/UE3070500-230_01_140_140_Experiment-Thomson-Tube-230-V-5060-Hz.jpg)
![Experiment: Electron Diffraction (230 V, 50/60 Hz), 8000704 [UE5010500-230], Fundamentals of Atomic Physics](/thumblibrary/UE5010500-230/UE5010500-230_01_140_140_Experiment-Electron-Diffraction-230-V-5060-Hz.jpg)