Stefan-Boltzmann's law of radiation with an amplifier  ![]()
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Unknown Principle According of Stefan-Boltzmann's law, the energy emitted by a black body per unit area and unit time is proportional to the power "four" of the absolute temperature of the body. Stefan-Boltzmann's law is also valid for a so-called "grey" body whose surface shows a wavelength independent absorption-coefficient of less than one. In the experiment, the "grey" body is represented by the filament of an incandescent lamp whose energy emission is investigated as a function of the temperature. Benefits - Classical experiment for studying black-body radiation
- High-precision measurement due to special, Moll-type thermopile
Tasks - To measure the resistance of the filament of the incandescent lamp at room temperature and to ascertain the filament's resistance R0 at zero degrees centrigrade.
- To measure the energy flux density of the lamp at different heating voltages. The corresponding heating currents read off for each heating voltage and the corresponding filament resistance calculated. Anticipating a temperature-dependency of the second order of the filament-resistance, the temperature can be calculated from the measured resistances.
Learning objectives - Black body radiation
- Thermoelectric e. m. f.
- Temperature dependence of resistances
Scope of delivery |
Optical bench expert l = 600 mm
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08283-00
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1
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Base for optical bench expert, adjustable
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08284-00
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2
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Slide mount for optical bench expert, h = 80 mm
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08286-02
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2
| |
PHYWE Universal measuring amplifier
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13626-93
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1
| |
Thermopile, Moll type
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08480-00
|
1
| |
PHYWE power supply, variable DC: 12 V, 5 A / AC: 15 V, 5 A
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13540-93
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1
| |
Lamp holder E 14,on stem
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06175-00
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1
| |
Filament lamp 6V/5A, E14
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06158-00
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3
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Connection box
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06000-00
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1
| |
Resistor 100 Ohm 2%, 1W, G1
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06057-10
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1
| |
PHYWE Digital multimeter, 600V AC/DC, 10A AC/DC, 20 MΩ, 200 µF, 20 kHz, −20°C…760°C
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07122-00
|
3
| |
Connecting cable, 32 A, blue, various lengths
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07361-04
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4
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Connecting cable, 32 A, red, various lengths
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07361-01
|
4
| |
Shielding tube, for 08480-00
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08480-01
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1
|
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Service
