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


Simplified implementation: all pre-settings already prepared

Intuitive, touch-optimized software

Recording of all required measured values via one device

Cost savings: No need for an additional measuring amplifier


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.


What you can learn about


Black body radiation

Thermoelectric e. m. f.

Temperature dependence of resistances


Operating system-independent software included. Computer not provided.