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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![Thermopile, 1000824 [U8441301], Greenhouse Effect](/thumblibrary/U8441301/U8441301_01_140_140_Thermopile.jpg)
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![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)
![Digital Oscilloscope, 2x30 MHz, 1020910 [U11834], Oscilloscopes](/thumblibrary/U11834/U11834_01_140_140_Digital-Oscilloscope-2x30-MHz.jpg)
![Helmholtz Coils S, 1000611 [U185051], Electron Tubes S](/thumblibrary/U185051/U185051_01_140_140_Helmholtz-Coils-S.jpg)
![Deflection Tube D, 1000651 [U19155], Electron Tubes D](/thumblibrary/U19155/U19155_01_140_140_Deflection-Tube-D.jpg)
![Digital Spectrometer LD with Absorption Chamber, 1019196 [U22031], Spectrophotometer](/thumblibrary/U22031/U22031_01_140_140_Digital-Spectrometer-LD-with-Absorption-Chamber.jpg)
![Spectrum Tube Power Supply (230V, 50/60 Hz), 1000684 [U418001-230], Spectrum Tubes and Spectrum Lamps](/thumblibrary/U418001-230/U418001-230_01_140_140_Spectrum-Tube-Power-Supply-230V-5060-Hz.jpg)
![Spectrum Tube Hydrogen, 1003409 [U41817], Spectrum Tubes and Spectrum Lamps](/thumblibrary/U41817/U41817_01_140_140_Spectrum-Tube-Hydrogen.jpg)
![Ruler, 1 m, 1000742 [U8401550], Measurement of Length](/thumblibrary/U8401550/U8401550_01_140_140_Ruler-1-m.jpg)
![Air Flow Apparatus, 1000765 [U8404300], Aerodynamics](/thumblibrary/U8404300/U8404300_01_140_140_Air-Flow-Apparatus.jpg)
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![Experiment: Inverse square law (230 V, 50/60 Hz), 8000691 [UE4050100-230], Intensity of Radiation](/thumblibrary/UE4050100-230/UE4050100-230_01_140_140_Experiment-Inverse-square-law-230-V-5060-Hz.jpg)