Here is the experimental file in the pdf format.
Planck-constant-using-photo-vaccum-diodeFind more Electromagnetic Theory related Practicals in this Link – https://alllabexperiments.com/phy_pract_files/emt/
Watch “Most Important Viva Questions” on LED and Planck’s Constant – https://www.youtube.com/watch?v=vLgI7uEDVXg