Planck's Constant by Leds
Item Code : SK014
Principle and Working:
The photon energy by Einstein equation E=hn 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 pdoped 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 is given by equation
In the present setup ,the Planck Constant is given by
h= eVoλ/c Where, Vo=V[ΔIn I/ΔT-1 X K/e Xη]
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- Variable Voltage source 0-2V , Resolution 1mV.
- Measuring Current meter 0-20mA, Resolution 0.001mA.
- Built-in Temperature sensor in Oven.
- Variable temperature control unto 65° Celsius.
- Determination of material Constant h.
- Determination of Temperature Coefficient of Current.
- Determination of Planck’s Constant by LED method.
- Plank constant : V-I and T-I mode, In V-I mode Display 3½ digit, 7segment LED, Voltage Range 0.000-2.000V, Current Range 0-2000mA In T-I mode, Display 3½ digit, 7segment LED, Current Range 0-20mA, Temp. Range ambient to 65.0°C.
- Oven : Temp. sensor Pt100, Heating Element 20Ω Heater at pin 4 & 5, Temp. sensor at pin 1 & 2, Oven Connector 5 Pin DIN type, LED Connector 3 Pin, DIN type.
- Sample LEDs : Yellow LED:⌀ 5mm, λ 590nm. Red LED:⌀ 5mm, λ 700nm. Green LED: ⌀ 5mm. λ 568 nm. Orange LED:⌀ 5mm, λ 610nm.
| S.No. | Item Name | SK014 |
|---|---|---|
| 1 | Power supply for Planck’s Constant | 1 |
| 2 | Oven | 1 |
| 3 | Red LED with connector | 1 |
| 4 | Yellow LED with connector | 1 |
| 5 | Green LED with connector | 1 |
| 6 | Orange LED with connector | 1 |
| 7 | Power Cord (Main Lead) | 1 |
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