Planck

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Measurement of Planck's constant using a light bulb (1.11)

Students Manual 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 Logrithmic plot for finding the value of gamma
A graph of photo-intensity verus temperature to determine Planck's constant
Further Readings and References

Thermal or blackbody radiation David Halliday, Robert Resnick and Kenneth S. Krane, Physics, John Willey \& Sons, Inc, pp. 1021-1025, (1992).
Planck's radiation law Raymond A. Serway, Clement J. Moses, and Curt A. Moyer, Modern Physics, Thomson learning, pp. 68-74 (2005).
Blachbody radiation and Planck's hypothesis Raymond A. Serway, John W. Jewett, Jr. Physics for Scientists and Engineers with modern Physics, pp. 1186-1191, (2010).
Planck's constant determination using a light bulb Brizuela, Graciela and Alfredo Juan, Am. J. Phys. 64(6), pp. 819-821 (1996).
Planck's constant determination from black-body radiation Dryzek, J. and Ruebenbauer, Am. J. Phys, 60(3), pp. 251-253 (1992).
Calibration and temperature profile of a tungsten filament lamp Izarra, Charles and Jean-Michel Gitton, Eur. J. Phys, 31, pp. 933-942 (2010).
Standard A-shape clear Koninklijke Philips Electronics N.V, 11 April 2012. Philips/lighting. 25 June 2012 www.philips.com/lighting.
Basic Physics of the Incandescent Lamp (Lightbulb) Maclsaac, Dan, Gary Kanner and Anderson Graydon,, The Physics Teacher, 37, pp. 520-525 (1999).
Temperature of incandescent lamps Vittorio Zanetti, Am. J. Phys, 53(6), pp. 546-548 (1985).

Pictorial Procedure (1.11)

1. Provided apparatus
1. Provided apparatus
2. This is how you'll measure the room temperature resistance of an incandescent light bulb
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
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
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
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
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
7. Rotate dial of the variac in clockwise direction to get variable voltages
8. Connecting a photodetector to the digital oscilloscope
8. Connecting a photodetector to the digital oscilloscope
9. Adjusting voltage sensitivity range of a digital oscilloscope
9. Adjusting voltage sensitivity range of a digital oscilloscope
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