This innovative experiment gives you an introduction of blackbody radiation and Planck's radiation law. The experimental objective involves the determination of the numerical value of Planck's constant using incandescent light bulb as a source of blackbody. Students will also practice error propagation and learn how to measure important parameters using weighted fit of a straight line.
|Sample Results||Logarithmic plot for finding the value of gammaA graph of photo-intensity verus temperature to determine Planck’s constant|
|Version||5 January 2016, 2016-v1|
Further Readings and References
- Temperature of incandescent lamps American Jornal of Physics , Vittorio Zanetti , 53(6) 546 , (1985).
- Basic Physics of the Incandescent Lamp (Lightbulb) The Physics Teacher , Maclsaac, Dan, Gary Kanner and Anderson Graydon , 37 520 , (1999).
- Standard A-shape clear Philips/lighting , Koninklijke Philips Electronics N.V
- Calibration and temperature profile of a tungsten filament lamp European Jornal of Physics , Charles and Jean-Michel Gitton , 31 933 , (2010).
- Planck’s constant determination from black-body radiation American Journal of Physics , Dryzek, J. and Ruebenbauer , 60(3) 251 , (1992).
- Planck’s constant determination using a light bulb American Journal of Physics , Brizuela, Graciela and Alfredo Juan , 64(6) 819 , (1996).
- Blackbody radiation and Planck’s hypothesis Physics for Scientists and Engineers with modern Physics , Raymond A. Serway, John W. Jewett, Jr 1186 , (2010).
- Planck’s radiation law Modern Physics, Thomson learning , Raymond A. Serway, Clement J. Moses, and Curt A. Moyer 68 , (2005).
- Thermal or blackbody radiation Physics, John Willey & Sons, Inc , D. Halliday, R. Resnick and Kenneth S. Krane 1021 , (1992).
1. Provided apparatus
|2. This is how you’ll measure the room temperature resistance of an incandescent light bulb||3. An assembly of optical components on the optical rail|
|4. Place optical components inside the black box and insert cylindrical tube (having bulb fitted inside) into the black box||5. The incandescent light bulb is connected to the variac through an ammeter in series||6. Circuitry of the setup. A voltmeter is connected in parallel configuration while an ammeter in series|
|7. Rotate dial of the variac in clockwise direction to get variable voltages||8. Connecting a photodetector to the digital oscilloscope||9. Adjusting voltage sensitivity range of a digital oscilloscope|