Product Overview

**Designed for export, this Planck's Constant Apparatus is designed for use on 220/240 Volts mains power and includes a BS1363 plug (see alternate photo).

NOT FOR USE IN NORTH AMERICA (USA/CANADA) OR ANY COUNTRY THAT OPERATES ON 110/120 MAINS.

Description
This device demonstrates the quantum mechanical property that energy is a function of frequency, not intensity, and to qualitatively show the photoelectric effect and Planck's constant. This machine is compact, convenient and easy to use.

Need a manual? Click this Product Instructions link for a product guide.

How It Works
Light shines from a halogen tungsten lamp, passes through a selection of 5 colored filters of different wavelengths and strikes a dark box with a phototube inside. The color filters are slotted to fit the receiver and are quickly and easily changed. The frequency of light incident on the emitter of the phototube causes photoelectrons to be ejected and pass through a vacuum to a collector. The photocurrent and photo voltage are then measured by a meter.

Current / voltage meter Current multiplier switch Voltage regulation knob Voltage direction switch Light intensity knob Receiving dark box with vacuum phototube mounted inside 5 color filters: 460,500,540,570 & 635nm 1 Solid black receiver cover Instruction Manual & Lab Manual

Power Supply: 220/240V AC / 50Hz
Light Source: 12V/35W halogen tungsten lamp