Determining Planck’s constant - Separation of wavelengths with a straight-view prism on the optical bench

VP6.1.4.2
Determining Planck’s constant - Separation of wavelengths with a straight-view prism on the optical bench
Determining Planck’s constant - Separation of wavelengths with a straight-view prism on the optical bench

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Description

The experiment P6.1.4.2 uses an open arrangement on the optical bench. The wavelengths of the light are dispersed using a direct-vision prism. The light of precisely one spectral line at a time falls on the cathode. 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 LD
1 558791  8  Holder for photocell LD
2 460317  8  Optical bench, S1 profile, 0.5 m LD
1 4603151  8  Swivel joint with protactor scale and clamp LD
2 460311  8  Clamp rider with clamp 45/65 LD
5 4603112  8  Clamp rider with clamp 75/65 LD
1 46002  8  Lens in frame, f=50 mm LD
2 46008  8  Lens in frame, f=150 mm LD
1 46162  8  Set of 2 slit diaphragms LD
1 46022  8  Holder with spring clips LD
1 46014  8  Adjustable slit LD
1 46605  4  Direct vision prism LD
1 46604  8  Holder for direct vision prism LD
1 45115  8  High pressure mercury lamp LD
1 451195  8  Power supply unit for high-pressure mercury lamp LD
1 53214  8  Electrometer amplifier LD
1 562791  4  Plug-in power supply, 12 V AC LD
1 57822  8  Capacitor, 100 pF, STE 2/19 LD
1 57910  8  Push button (NO), STE 2/19 LD
2 590011  8  Clamping plug LD
1 531120  4  Multimeter LDanalog 20 LD
1 50110  4  BNC adapter, straight LD
1 50109  4  BNC/4-mm plug adapter, single-pole LD
1 34089  4  Coupling plug 4 mm LD
1 50204  8  Distribution box with earthing socket LD
1 50145  4  Connecting lead 19 A, 50 cm, red/blue, pair LD
2 500440  4  Connecting lead, 19 A, 100 cm, yellow/green LD
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