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Determining Planck’s constant - Selection of wavelengths using interference filters on the optical bench /
Determining Planck’s constant - Selection of wavelengths using interference filters on the optical bench

Determining Planck’s constant - Selection of wavelengths using interference filters on the optical bench

VP6.1.4.3

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Description

In the experiment P6.1.4.3, the capacitor method is used to generate the opposing voltage U between the cathode and the anode of the photocell. A capacitor is connected between the cathode and the anode of the photocell which is charged by the anode current, thus generating the opposing voltage U. As soon as the opposing voltage reaches the value –U₀, the anode current is zero and the charging of the capacitor is finished. U₀ is measured without applying a current by means of an electrometer amplifier.
Note: The opposing voltage U can alternatively be tapped from a DC voltage source. The I-measuring amplifier D is recommended for sensitive measurements of the anode current (see P6.1.4.4).

Components of equipment sets

1	55877	Photocell for determining Planck's constant
1	558791 4	Holder for photocell
1	460317 8	Optical bench, S1 profile, 0.5 m
1	460311 4	Clamp rider with clamp 45/65
4	4603112 8	Clamp rider with clamp 75/65
1	46841 8	Holder for interference filters
1	468401 4	Interference filter, 578 nm
1	468402 4	Interference filter, 546 nm
1	468403 8	Interference filter, 436 nm
1	468406 4	Interference filter, 365 nm
1	46003 4	Lens in frame, f=100 mm
1	46026 8	Iris diaphragm
1	45115 4	High pressure mercury lamp
1	451195 4	Power supply unit for high-pressure mercury lamp
1	53214 8	Electrometer amplifier
1	562791 4	Power supply unit (mains adaptor), 12 V AC
1	57822 8	Capacitor, 100 pF, bipol., STE 2/19
1	57910 4	Pushbutton (NO), STE 2/19
2	590011 8	Clamping plug
1	531120	Multimeter LDanalog 20
1	50110 4	BNC adapter, straight
1	50109 4	BNC/4-mm plug adapter, single-pole
1	34089 4	Coupling plug 4 mm
1	50204 4	Distribution box with earthing socket
1	500421 4	Connecting lead 19 A, 50 cm, red
1	500422 4	Connecting lead 19 A, 50 cm, blue
2	500440 4	Connecting lead, 19 A, 100 cm, yellow/green
1	468404 8	* Interference filter, 405 nm

Articles marked with * are not essential, we do however recommend them to carry out the experiment.

Experiment Instructions

PDF (Experiment description)

P6.1.4.3 Determining Plancks constant - Selection of wavelengths using interference filters on the optical bench

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Determining Planck’s constant - Selection of wavelengths using interference filters on the optical bench

Description

Components of equipment sets

Experiment Instructions

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