Measuring Planck’s Constant with L E D s. © 2008 Stephen Ducharme. In 1900, German physicist Max Planck (1858-1947) was trying to model the broad smooth spectrum of electromagnetic radiation (i.e., light) emitted by a warm body.
© 2008 Stephen Ducharme
In 1900, German physicist Max Planck (1858-1947) was trying to model the broad smooth spectrum of electromagnetic radiation (i.e., light) emitted by a warm body.
green spectrum line at 546 nm from the presence of Mercury vapor in the fluorescent bulb.
For more information on LEDs go to the web site:
If the reading is not a definite line, read the middle and record this on your data chart.
Here is an example using the UV LED as an example.
(1) IR = Infrared, R = red, Y = yellow, O = Orange, G = Green, B = Blue. Other colors may be available.
(2)Digikey(800) 344-4539. Edmund Scientific (609) 573-6250. Pasco (800) 772-8700. STAR Spectrometer, Model PS-14 plastic from Learning Technologies Project (800) 537-8703, or model OA-160 from the Astronomical Society of the Pacific (800) 335-2624 or http://www.aspsky.org/aspcat/observ2.html#proj. Mouser Electronics (800) 346-6873. You can find similar items from other vendors, including standard educational physics equipment suppliers Pasco, KEP, Jameco, and others. Radio Shack has all the necessary Electronic components and a selection of multimeters as do Digikey, Mouser, and Newark Electronics. Call for Catalogs today!