Demonstrations

Spectrum Vs. Temperature - Wien's Law

Code Number :	6B40.55
Disclaimer:	Reprinted by permission of Dick Berg, University of Maryland, for use on this website. The demonstrations contained and referenced herein are listed for the purposes of cataloging and describing physics demonstrations which should be conducted only under the direction of a trained instructional support professional or physicist. These demonstrations are not presented for the purpose of being conducted by persons unconnected to this Facility and/or persons not consulting with or being supervised by the recognized instructional support professional or physicist and his/her staff. The University is responsible only for those demonstrations carried out using its own equipment using established safety and scheduling policies, and bears no responsibility for those choosing to use this source material for their own purposes. All demonstrations described and contained herein are public domain, and can also be found in reference materials in libraries, bookstores, and electronic sources. Further information regarding legal liability in use of demonstrations and labs will be found on the web site Injuries in School/College Laboratories in USA. The University of Iowa Disclaimers: University of Iowa Disclaimer All Rights Reserved..
Condition :	Good
Principle :	Wein's Law
Area of Study :	Astronomy
Equipment :	White Light Weins Law Projector, Prism or Grating.
Procedure :	Set up the Weins law projector making sure to put the Variac on the light not the fan. Place the grating in the light beam. With fan running turn the Variac on slowly and watch the spectrum go from the red portion of the spectrum to showing the whole spectrum.

References

Biman Das, "Obtaining Wien's Displacement Law from Planck's Law of Radiation," TPT, Vol. 40, # 3, p. 148, (March 2002)

Mark L. Biermann, Debora M. Katz, Robert Aho, James Diaz-Barriga, Jerome Petron, "Wien's Law and the Temperature of the Sun," TPT, Vol. 40, # 7, p. 398, (Oct 2002).

"Astronomy Demonstrations," PIRA News, Vol. 9, No. 3, pp. 21, (January 1995).

Ronald Ebert, "Adapting Some Demonstrations for a Large Class," TPT, Vol. 30, # 4, p. 239, (April 1992).

William S. Wagner, "Temperature and Color of Incandescent Lamps," TPT, Vol. 29, # 3, p. 176, (March 1991).

Don Hruby, "Doing Physics", TPT, Vol. 25, # 6, Sept. 1987, p. 402.

Mario Iona, "Red Hot", TPT, Vol. 26, # 5, May 1988, p. 265.

O-270: "Prisms-Glass & Ethyl Cinnamate," DICK and RAE Physics Demo Notebook.

S-170: "Line Filament with R/G Filters," DICK and RAE Physics Demo Notebook.

Tap-L comments by Cliff Bettis, 2004.

T. D. Rossing, C. J. Chiaverina, "# 9, Spectrum As a Function of Temperature", Light Science, Physics and Visual Arts, p. 149.

Mail Questions and Comments to: Dale Stille