Compact, easy-to-use apparatus. Accurate results with less than 5% error. Measures Planck's constant and estimates the work function of the cesium. The Planck’s Constant Apparatus is a compact unit containing an enclosed vacuum photocell with an attachment for illuminating light sources, a high stability power supply for applying a variable stopping voltage to the cell and a nanoammeter for measuring the resulting photocurrents. Additional Info: Measures planck's constant and estimates the work function of the cesium. Includes a detailed activity guide. Package Size(L x W x H): 16 X 12 X 12 (IN) Categories: Advanced Physics, Demonstrations HTS Code: 9023.00.0000 UNSPSC: 6.01048e+007 Country Of Origin: CHINA