Planck's Constant by Cs Photocell
Item Code : SK054
Principle and Working:
Einstein postulated that light consists of quanta of particles, called photons, whose energy (E) is proportional to their frequency (ν), given by the equation:
In this experiment, narrow-band interference filters are used to select specific wavelengths. Each filter isolates a single spectral line from the light of a high-pressure mercury lamp. The monochromatic light then falls on the cathode of a photocell.
A capacitor, connected between the cathode and anode of the photocell and charged by the anode, is used. An electrometer amplifier measures the voltage across the capacitor without drawing any current.
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- Multipurpose electrometer amplifier.
- Cs photo cell.
- Multipurpose power supply.
- Monochromatic light source.
- Heavy, rigid and stable Optical bench.
- Saddle can hold rod from 8 to 15mm.
- To determine Planck’s Constant by Cs Photocell.
- Optical bench : Length – 1.5 mtr. with Scale, 4 point levelling. Material Aluminium or MS.
- Power supply : 2,3,4,5,6,8,10 & 12VAC full wave rectified, unsmoothed & unregulated D.C, Resettable thermal trip, Input 230 V AC,50 Hz.
- Mercury light : Starting Voltage 470 Volts, Input Voltage 220 Source volts, 50 Hz, Lamp House 250 x 100mm (L x dia.) Aperture dia 25mm, Mercury Lamp 125W.
- Electrometer : Input Impedance >1013 W, Input Current <0.5pA, Output Voltage upto +10V, Output Current 5mA, (Short Circuit Protected), Output impedance <1W, Supply Voltage 12V AC.
- Photocell : Photocell Cs, vacuum tube, Output4mm safety socket, Mounting rod 10mm dia.
- Color Filter set : Red 635nm, Orange 570nm,Yellow 540nm, Green 500nm, Blue 460nm.
| S.No. | Item Name | SK054 |
|---|---|---|
| 1 | Transverse Slider | 1 |
| 2 | Fixed Slider | 2 |
| 3 | Optical Bench with Levelling | 1 |
| 4 | Earthing Rod | 1 |
| 5 | Earth Pin | 1 |
| 6 | Capacitor Module 0.01kpf, 630 V | 1 |
| 7 | Capacitor Module 100pf | 1 |
| 8 | Iris Diaphragm in Holder | 1 |
| 9 | Electrometer Amplifier | 1 |
| 10 | Digital Multimeter | 1 |
| 11 | Power Supply 2-14V | 1 |
| 12 | Push Button Module | 1 |
| 13 | Convex Lens in Holder (FL 20CM) | 1 |
| 14 | Set of Six Filter | 1 |
| 15 | Flexible Plug Lead 50cm (Black) | 1 |
| 16 | Flexible Plug Lead 100cm (Black) | 3 |
| 17 | Flexible Plug Lead 50cm (Red) | 1 |
| 18 | Flexible Plug Lead 100cm (Red) | 1 |
| 19 | Flexible Plug Lead 100cm (Yellow) | 3 |
| 20 | Photo Cell | 1 |
| 21 | Power Cord (Main Lead) | 2 |
| 22 | Mercury light source | 1 |
| 23 | Stand Base (A Shaped) | 1 |
| 24 | Power Supply for Mercury Light | 1 |
| 25 | Boss Head Square (Universal Clamp) | 1 |
| 26 | Clamping Rod | 1 |
| 27 | Stand Rod | 1 |
| 28 | Mercury Bulb (125 W) | 1 |
Note : Computer/Laptop is not supplied with this setup.
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