Principle and Working:
The emission of electrons by a metal material when the latter is exposed to electromagnetic radiation of a sufficiently high frequency, is a means of approaching and better understanding the particulate aspect of light. The experiment proposed, using our photoelectric cell, a HP mercury spectral lamp and a micro-ammeter, aims at showing the photoelectric effect, verifying Einstein’s equation and experimentally measuring Planck’s constant.
To do this, the photoelectric cell, with a spectral range from approx. 340 to 700 nm, is installed in a metal box ensuring its light insulation and safety. A drum secured on the front of this box allows a variety of filters and diaphragms to be placed in front of the cell to perform a set of measurements. Last but not least, one device only is used to supply both the cell anode and cathode with two voltage ranges (-2/2 V and -2/30 V) and as micro- ammeters to measure photo-current (with a number of measurement ranges:
10-8 to 10-13 A).
