PASCO TD-8555 THERMAL RADIATION SYSTEM - Manual (Page 17)

13
012-04695D Thermal Radiation System
Experiment 3: Stefan-Boltzmann Law (high temperature)
EQUIPMENT NEEDED:
— Radiation Sensor — Stefan-Boltzmann Lamp
— Ohmmeter — Ammeter (0-3 A)
— Voltmeter (0-12 V) — Millivoltmeter
— Ohmmeter — Thermometer.
Introduction
The Stefan-Boltzmann Law relates R, the power per unit area radiated by an object, to T, the
absolute temperature of the object. The equation is:
R =
σ
T
4
;
σ
=5.6703 x 10
–8 W
m
2
K
4
In this experiment, you will make relative measurements of the power per unit area emitted
from a hot object, namely the Stefan-Boltzmann Lamp, at various temperatures. From your
data you will be able to test whether the radiated power is really proportional to the fourth
power of the temperature.
Most of the thermal energy emitted by the lamp comes from the filament of the lamp. The
filament temperature can be determined using the procedure given on pages 3 and 4 of this
manual.
– +
+ –
6 cm
Figure 3.1 Equipment Setup
Voltmeter
Ammeter
Millivoltmeter
Power Supply
(13 V MAX!)