Planck’s Constant Determination Box

Email this Product to a Colleague

Overall Rating :
and share your thoughts with other customers

Sort Reviews : Newest  | Oldest  | Highest Rating   | Lowest Rating  

 -  Tuesday, April 14, 2009
Bang for the Buck
Reviewed By: Todd (Brea, California)
This apparatus is unbelievably simple to use. Simply attach a voltmeter where it says 'V' and an ammeter where it says 'A' and then a 9-volt battery across the potentiometer. The idea is to find the very smallest voltage that will allow an electron passing through one of seven LED's to emit a photon at a known wavelength. As a little bonus, the device comes with a little black viewing tube that gets placed over each LED in turn to allow students to see the photons since ambient light is then blocked out. The students notice that the faintest light is seen when the ammeter is very very nearly zero. My students were generally off the accepted value by about 6-10% which is great. Until I found this product, I was using simulations from the internet.


Read More Reviews