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)
![Set of 15 Safety Experiment Leads, 75 cm, 2.5 mm², 1002843 [U138021], Circuits](/thumblibrary/U138021/U138021_01_140_140_Set-of-15-Safety-Experiment-Leads-75-cm-25-mm.jpg)
![Barrel Foot, 1 kg, 1002834 [U13265], Bases](/thumblibrary/U13265/U13265_01_140_140_Barrel-Foot-1-kg.jpg)
![Thermopile, Moll Type, 1000824 [U8441301], Greenhouse Effect](/thumblibrary/U8441301/U8441301_01_140_140_Thermopile-Moll-Type.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 – Type 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)
![Set of Experiment Leads for Electron Tube Experiments, 1002847 [U138101], Experiment Leads and Cables](/thumblibrary/U138101/U138101_01_140_140_Set-of-Experiment-Leads-for-Electron-Tube-Experiments.jpg)
![Thomson Tube S, 1000617 [U18555], Electron Tubes – Type S](/thumblibrary/U18555/U18555_01_140_140_Thomson-Tube-S.jpg)
![Electron Diffraction Tube S, 1013889 [U185711], Electron Tubes – Type S](/thumblibrary/U185711/U185711_01_140_140_Electron-Diffraction-Tube-S.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 Hydrogen, 1003409 [U41817], Spectrum Tubes and Spectrum Lamps](/thumblibrary/U41817/U41817_01_140_140_Spectrum-Tube-Hydrogen.jpg)
![Graduated Ruler, 1 m, 1000742 [U8401550], Measurement of Length](/thumblibrary/U8401550/U8401550_01_140_140_Graduated-Ruler-1-m.jpg)
![Air Flow Apparatus, 1000765 [U8404300], Aerodynamics](/thumblibrary/U8404300/U8404300_01_140_140_Air-Flow-Apparatus.jpg)
![High Voltage Power Supply E (230 V, 50/60 Hz), 1013412 [U8498294-230], Power Supplies](/thumblibrary/U8498294-230/U8498294-230_01_140_140_High-Voltage-Power-Supply-E-230-V-5060-Hz.jpg)
![Demo Multimeter, 1017895 [U8557160], Demo Multimeter](/thumblibrary/U8557160/U8557160_01_140_140_Demo-Multimeter.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)