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Plank's Constant Apparatus
To Plot Forward & Reverse Chat of a Vacuum Photo cell & to Calculate its stopping potential.
Dual Range Power upply 0-1VDC/0-50 VDC with one dual range voltmeter & one sensitive centre zero Galvanometer of 25µA movement.Photo Cell mounted in wooden box having window for injectinf light & also for sliding the various filters. One wooden Plank with 1/2 meter scale, light source with 100W lamp 7 set of filters.