Plancks Constant Apparatus

Product Description

1. The Planck's Constant Unit can be used:As a direct method that gives a reasonable order of magnitude value for Planck's constant, hFor the demonstration of photoelectric effect and the principle of applying a backing potential difference to reduce the anode current to zeroThe unit contains a photo emissive Caesium Antimony cathode, with a spectral response of 185-650nm. When light of frequency, f, strikes the cathode, electrons of energy E=hf-W0 are released and would normally reach the anode, producing a current which can be registered on a very sensitive instrument such as a Picoammeter (B8G85756) or an Electrometer.The potential difference from an internal PP3 (6F22)-type cell can be adjusted to a value V where the anode current is just reduced to zero. V is proportional to the frequency of light used. This apparatus enables values of V to be found for various frequencies of light selected by placing each of the colour filters in turn over the cell. A plot of V vs. f gives a reasonable straight line where the gradient is h/e.The Planck's Constant Unit requires the following to operate:Spacesaver Picoammeter (B8G85756)PP3 Battery (B8R05410)Easy-Read Meter (B8R02652)20V d.c. Attachment (B8H30919)Colour Filters set of six (B8R05407) Set of 3 Narrow band filters (B8R05408)All of the required equipment for Planck's Constant can also be purchased together in the Planck's Constant Kit (B8H76701)

1. Brand: School Stationery
2. rrp: £602.69  
3. Pack Size: 1  
4. Parcel Dimensions: n/a  
5. School Stationery Reference: HE1010281  
6. EAN/UPC Number: