This document summarizes the results of several experiments on thermal radiation and the inverse square law of heat. In Experiment 1, the inverse square law is tested by measuring radiation levels at different distances from a heat source, and the results fit an inverse square relationship as expected. Experiment 2 evaluates Stefan-Boltzmann's law relating radiation to temperature using a black body, though the calculated results do not perfectly match the expected value. Experiment 3 measures the emissivity of different metal plates to see how surface affects radiation. Experiment 4 examines how the emissivity of plates is affected by their proximity. Finally, Experiment 5 looks at how the area of an aperture affects radiation measurements. The conclusion is that these experiments demonstrate various factors that influence thermal

1. EXPERIMENT 1:
THERMAL RADIATION
RAUL A. RODRIGUEZ CARMONA
ID 79009

2. INVERSE SQUARE LAW OF HEAT
The inverse-square law, in physics, is the law stating that a specified physical quantity or intensity is inversely proportional
to the square of the distance from the source of that physical quantity. Thus the radiation and the distance are presented in
natural logarithmic form.

3. INVERSE SQUARE LAW OF HEAT: EXPERIMENTAL
RESULTS
Table II: Data for Square Law of Heat
Ln x -1.6094 -1.204 -0.9163 -0.693 -0.511 -0.357 -0.2231
Ln q 8.55293 7.82354 7.26224 6.8208 6.4484 6.1277
5.8481
1
Plot lnq vs lnx linear regression: y=b+mx b= 5.4415
y=lnq, x=lnx m= -1.9576
Table I: Radiation Results for Inverse Square Law
Distance x (m) 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Radiation q=5.59 R (W/m^2) 5181.93 2498.73 1425.45 916.76 631.67 458.38 346.58
Plotted as q vs x Power curve fitting for q=axb b= -1.958

4. STEFAN BOLTZMANN-LAW
The blackbody consists that all the radiation is absorbed in its direction and length of area. The emissive
power of a blackbody is proportional to the fourth power of the temperature. Performing the integration
of the Planck distribution.

5. STEFAN BOLTZMANN-LAW: EXPERIMENTAL RESULTS
• The black body radiation result from the
plate was suppose to be 1 but the
calculated result was 0.0545
• The increase of temperature of the heat
source increases the temperature in the
plate surface at a distance.

6. EMISSIVITY 1
The emissivity of three metal plates with different surfaces is determined and compared with one another
within a range of temperatures. These values are graphed and compared to one another to allow for
visualization of the effect of a material surface on thermal radiation.

7. EMISSIVITY 1:EXPERIMENTAL RESULTS
THE AVERAGE EMISSIVITY'S FOR BLACK, SILVER AND POLISHED PLATES
ARE 0.07588, 0.03586, AND 0.00210.WHEN NORMALIZED AT A
TRENDLINE LEVEL THE EMISSIVITY'S FOR SAID PLATES ARE
0.0545,0.0193,AND 0.0033.

8. EMISSIVITY 2
This experiment demonstrates how emissivity of radiating surfaces on proximity to each other will affect
the surface temperatures and heat emitted. Thus, at a given output different emissivity results are to be
found according to the plate combinations used.

9. EMISSIVITY 2: EXPERIMENTAL RESULTS

10. AREA FACTOR
This experiment shows how the exchange of radiant energy between surfaces is dependent on the
interconnecting geometry. Thus, it is evaluated by the relationship between the aperture diameter and the
radiometer reading.

11. AREA FACTOR: EXPERIMENTAL RESULTS
Table IX: Area Factors
Plate Temp: 449 K
Aperture (m)
0.06 0.05 0.04 0.03 0.02 0.01 0
Thermal Radiation q (W/m^2) 760.24 726.7 704.34 564.59 380.12 184.47 16.77

12. CONSLUSION
From this experiment we can see the process of thermal radiation. Thermal radiation is energy emitted by
matter that is at a finite temperature. We can conclude that depending the arrangement that why give to
a sorting system we can obtain different readings of radiation and emissivity. We can work with different
types of body's that can help us repel or absolves radiation that work to are advantage.