Planck’s Constant
Item Code : SN627
Principle and Working:
The photon energy by Einstein equation E=hv is equal to energy gap Eg between the valence and conduction bands. The energy Eg is equal to the energy barrier eV0 , that electron have to overcome in going from n-doped side of diode junction to p-doped side when no external voltage V is applied to the diode. In the p-doped side, electron recombine with holes releasing the energy Eg in the form of photon emit given by equation.
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- Inbuilt power supply & photocell.
- Different types of filters and LED.
- Different types of wave length of filters and LED.
- To determine planck’s constant.
- To verify the inverse square law.
- Light source : Tungsten-halogen 12V / 35W.
- Scale : Length 400mm.
- Photocell : Cs Vacuum Phototube.
- Dark-current : < 0.003 µA.
- Display mode switch : Displays current (mA) or voltage(V).
- Current multiplier : X1, X0.1, X0.01 & X0.001.
- Accelerate Voltage : -15V to 0V & 0 to15V, < ±2%.
- Power supply : 220V / 50Hz.
- Measuring error : < ± 15% compared with the recognized value (h=6.62619x 10-34J.S).
| S.No. | Item Name | SN627 |
|---|---|---|
| 1 | Planck’s constant apparatus | 1 |
| 2 | Set of color filters | 1 |
Note : Computer/Laptop is not supplied with this setup.
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