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

P6.1.4.3
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

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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

1 558 77 Photocell for determining Planck's constant LD
1 558 791  4  Holder for photocell LD
1 460 317  8  Optical bench, S1 profile, 0.5 m LD
1 460 311  4  Clamp rider with clamp 45/65 LD
4 460 3112  8  Clamp rider with clamp 75/65 LD
1 468 41  8  Holder for interference filters LD
1 468 401  4  Interference filter, 578 nm LD
1 468 402  4  Interference filter, 546 nm LD
1 468 403  8  Interference filter, 436 nm LD
1 468 406  4  Interference filter, 365 nm LD
1 460 03  4  Lens in frame, f=100 mm LD
1 460 26  8  Iris diaphragm LD
1 451 15  4  High pressure mercury lamp LD
1 451 195  4  Power supply unit for high-pressure mercury lamp LD
1 532 14  8  Electrometer amplifier LD
1 562 791  4  Power supply unit (mains adaptor), 12 V AC LD
1 578 22  8  Capacitor, 100 pF, bipol., STE 2/19 LD
1 579 10  4  Pushbutton (NO), STE 2/19 LD
2 590 011  8  Clamping plug LD
1 531 120 Multimeter LDanalog 20 LD
1 501 10  4  BNC adapter, straight LD
1 501 09  4  BNC/4-mm plug adapter, single-pole LD
1 340 89  4  Coupling plug 4 mm LD
1 502 04  4  Distribution box with earthing socket LD
1 500 421  4  Connecting lead 19 A, 50 cm, red LD
1 500 422  4  Connecting lead 19 A, 50 cm, blue LD
2 500 440  4  Connecting lead, 19 A, 100 cm, yellow/green LD
1 468 404  8  * Interference filter, 405 nm LD

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

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