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Plancks Constant Determination Box
Plancks Constant Determination Box (Product Code: SLE/PHY/50) is an LED-based apparatus used to find an approximate value of Planck's constant from the elbow voltage in LED characteristic curves in physics laboratories. Seven LEDs, from deep blue at 470 nm to near infrared at 940 nm, are mounted on the box with sockets for voltage and current measurements, making it a compact Planck constant experiment kit. It is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Method | Elbow voltage in the characteristic curves of a number of LEDs |
| Number of LEDs | 7, mounted on the box |
| Wavelength range | 470 nm (deep blue) to 940 nm (near infrared) |
| Connections | Sockets for voltage and current measurements |
| Power | External 9 V power source or 9 V battery required |
| Leads | Connecting leads required |
| Product code | SLE/PHY/50 |
| Supplied by | Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India |
What Is the Planck's Constant Box Used For?
Students connect each LED in turn, raise the voltage slowly and note the value at which it just begins to emit light — the elbow of its current–voltage curve. That voltage multiplied by the electron charge gives the energy of the emitted photons; plotting energy against light frequency, worked out from each LED's wavelength, gives a straight line whose gradient approximates Planck's constant.
With seven LEDs spread from 470 nm to 940 nm, the graph has enough points for a clear straight-line fit, and the exercise doubles as an LED characteristics experiment kit for electronics topics. For the near-infrared LED the light cannot be seen, so read its turn-on point from the current meter instead of by eye.
What to Specify When Ordering
- Power: whether you will use an external 9 V source or a 9 V battery.
- Connecting leads and meters for the voltage and current sockets.
- Number of boxes, for example one per bench group or one for demonstration.
Supplier
Jain Scientific Equipments Private Limited, trading as ScienceLab, supplies the Plancks Constant Determination Box from Ambala, Haryana, India, to schools, colleges and dealers. The company sources the box and can add the meters, leads and power source needed for the practical to the same quotation.
Vendor details for purchase files: Jain Scientific Equipments Private Limited, CIN U29309HR2020PTC087597, GSTIN 06AAECJ8618A1ZT. More about the company is on our profile page.
Related Physics Lab Equipment
These items supply the power, connections and measurements the Plancks Constant Determination Box needs:
- Standard Digital Multimeter — measures the LED voltage and current.
- Digital Voltmeter — a dedicated bench voltmeter for the turn-on voltage.
- Crocodile Clips & Leads — connecting leads for the box and meters.
- Battery Clip, PP3 — connects a 9 V PP3 battery as the power source.
- Planck's Constant Apparatus — photoelectric method for a second, independent value.
Explore more Physics Lab Equipment.
Frequently Asked Questions
How does the Plancks Constant Determination Box find Planck's constant?
The Plancks Constant Determination Box uses the elbow voltage in the characteristic curve of each LED. Plotting the photon energy from that voltage against light frequency for all seven LEDs gives a line whose gradient is an approximate value of Planck's constant.
What LED wavelengths are on the Plancks Constant Determination Box?
The Plancks Constant Determination Box carries seven LEDs covering deep blue at 470 nm to near infrared at 940 nm. This spread gives a wide frequency range for the energy–frequency graph that students plot.
What else is needed to use the Plancks Constant Determination Box?
To use the Plancks Constant Determination Box you need an external 9 V power source or a 9 V battery, connecting leads, and meters for the voltage and current sockets on the box. These can be added to the same quotation on request.
How precise is the value from the Plancks Constant Determination Box?
The Plancks Constant Determination Box is designed to give an approximate value of Planck's constant, which suits teaching the link between photon energy and frequency. Students can compare their result with a second, independent method such as the photoelectric experiment.
Who supplies the Plancks Constant Determination Box?
The Plancks Constant Determination Box is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India, to schools, colleges and dealers in India and international markets. Contact us with the quantity you need for a quotation.
What should a Plancks Constant Determination Box enquiry include?
For the Plancks Constant Determination Box, state the number of boxes, whether you need a 9 V battery or power source, and whether meters and leads should be quoted too. Use the contact page or the enquiry cart to send it.
Request a Quote
Price the Plancks Constant Determination Box by writing to us through the contact page, or add the box, meters and leads to the enquiry cart.
Last updated: 24 September 2026
