Plank’s Constant Apparatus

Objective : To plot Forward & Reverse Characteristics of a Vacuum Photo cell & to Calculate its stopping Potential.

Features : Dual range Power Supply 0-1VDC/ 0-50 VDC with one dual range voltmeter & one sensitive centre zero Galvanmeter of 25 mA movement, Photo cell mounted in wooden box having window for injecting light & also for sliding the various filters. One wooden plank with 1/2 meter scale, light source with 100 W lamp & set of filters.

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