Determining Planck’s Constant - Selection of Wavelengths Using Interference Filters on the Optical Bench

In the experiment P6.1.4.3, the capacitor method described previously (see P6.1.4.1) is used to generate the opposing voltage U between the cathode and the anode of the photocell. The voltage at the capacitor is measured without current using the 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 Experiment:

1	558 77	Photocell for determining Planck's constant
1	558 791	Holder for photocell
1	460 317	Optical bench, S1 profile, 0.5 m
2	460 3112	Clamp rider with clamp 75/65
3	460 3113	Clamp rider with clamp 105/65
1	468 41	Holder for interference filters
1	468 401	Interference filter, 578 nm
1	468 402	Interference filter, 546 nm
1	468 403	Interference filter, 436 nm
1	468 406	Interference filter, 365 nm
1	460 03	Lens in frame, f=100 mm
1	460 26	Iris diaphragm
1	451 15	High pressure mercury lamp
1	451 195	Power supply unit for high-pressure mercury lamp
1	532 14	Electrometer amplifier
1	562 791	Plug-in power supply, 12 V AC
1	578 22	Capacitor, 100 pF, STE 2/19
1	579 10	Push button (NO), STE 2/19
2	590 011	Clamping plug
1	531 120	Multimeter LDanalog 20
1	501 10	BNC adapter, straight
1	501 09	BNC/4-mm plug adapter, single-pole
1	340 89	Coupling plug 4 mm
1	502 04	Distribution box with earthing socket
1	501 45	Connecting lead 19 A, 50 cm, red/blue, pair
2	500 440	Connecting lead, 19 A, 100 cm, yellow/green
1	468 404	* Interference filter, 405 nm

Experiment Instructions Click Here