PASCO OS-8542 BLACK BODY LIGHT SOURCE - Manual (Page 18)

Black Body Instruction Manual 012-07105B
14
Black Body Experiment - Sample Graphs (Data Studio)
Note: The window appearances in the following graphs are subject to change
with updated versions of the DataStudio software.
Light Intensity vs. Wavelength
Light Intensity vs. Angular Position
Teacher’s Guide (Continued)
Activity 1: Black Body Temperatures
Data Run Time (s) Volts ΔV Temp. (K) ΔT (rads)
1 12.06 1 1 2762.983 ----- 661 12.9
13.40 2 1 2764.252 2.269 741 13.6
14.56 3 1 2764.464 0.212 803 14.0
14.56 4 1 2766.554 2.090 862 14.3
17.14 5 1 2767.513 0.959 933 14.7
19.90 6 1 2771.716 4.203 1046 15.0
Questions/Exercise for Students:
1) How does changing the temperature of the bulb affect the wavelength or light intensity? Do you notice a
pattern with increasing temperature?
2) From what you remember from the lesson on the grating spectrophotometer, what differences have you
observed between using a prism and a grating?
3) On a piece of paper, draw a diagram showing the position of the reference angle, measured angle and
spectral lines. Do the spectral lines converge or diverge? Do the light rays overlap?
4) What would happen if you removed the collimating lens?
5) What is the relationship between the light’s angle, wavelength and intensity?
6) What differences do you notice between the black body and other types of light sources you have used?
7) Replace the infrared light sensor with the high sensitivity light sensor. What differences do you notice
in the graph displays?
λ