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Planck's Constant Apparatus
Planck's Constant Apparatus (Product Code: SLE/PHY/47) is a ready-built circuit used to measure the photoelectric effect and determine Planck's constant in physics laboratories. Inside are a caesium antimony photocathode, a DC supply with a 10-turn potentiometer for the retarding voltage and a 0–19.99 V LED display, while six narrow-band filters vary the light frequency. It is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Photocell | Caesium antimony cathode, spectral response range 185–650 nm |
| Stopping potential | DC, controlled by a 10-turn potentiometer |
| Voltage display | DC voltmeter with 0–19.99 V LED display |
| Filters | 6 narrow-band filters, FWHM bandwidth 4–15 nm |
| Filter wavelengths | 405 nm is among the listed wavelengths; ask us for the full set |
| Output socket | Female UHF socket for connection to a picoammeter |
| Lead included | 4 mm to UHF lead for connecting the picoammeter |
| Power source | 9 V PP3 battery |
| Dimensions | 205 x 150 x 115 mm (W x H x D) |
| Product code | SLE/PHY/47 |
| Supplied by | Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India |
What Is the Planck's Constant Apparatus Used For?
Light of a known frequency, selected with one of the six filters, falls on the caesium antimony cathode and releases photoelectrons. Students raise the retarding voltage with the 10-turn potentiometer until the picoammeter reading falls to zero and note this stopping potential on the digital display. Repeating with each filter gives a set of stopping potentials that, plotted against frequency, form a straight line whose gradient is h/e.
Because the circuit is ready-built and battery-powered, set-up time is short, which makes it a practical photoelectric effect kit for senior secondary and undergraduate courses in India. The photocurrent is tiny, so the apparatus is ideally used with a picoammeter, connected through the supplied 4 mm to UHF lead.
What to Specify When Ordering
- Whether you need a picoammeter, which the apparatus is designed to work with but which is not listed as included.
- Confirmation of the six filter wavelengths on your quotation.
- Spare 9 V PP3 batteries.
- Number of units needed for your practical groups.
Supplier
ScienceLab is the trading name of Jain Scientific Equipments Private Limited, which supplies the Planck's Constant Apparatus to schools, colleges and universities from Ambala, Haryana, India. The company sources the apparatus and can quote it with the other items needed for the photoelectric practical.
Institutional buyers completing vendor registration can use the company's GSTIN 06AAECJ8618A1ZT and its Legal Entity Identifier (LEI) 3358004HRD1JIVXKYX49. More about us is on the profile page.
Related Physics Lab Equipment
These items fit the same quantum physics teaching unit as the Planck's Constant Apparatus:
- Plancks Constant Determination Box — an LED-based method for estimating Planck's constant.
- Teltron Electron Diffraction Tube D — demonstrates the wave nature of electrons.
- Teltron Diode S — thermionic emission, for comparison with photoemission.
- Spectroscope, Direct Vision — for examining the spectral composition of light sources.
Browse all Physics Lab Equipment.
Frequently Asked Questions
What is included with the Planck's Constant Apparatus?
The Planck's Constant Apparatus includes the photocell circuit with a caesium antimony cathode, a DC retarding-voltage supply with 10-turn potentiometer, a 0–19.99 V LED display, six narrow-band filters and a 4 mm to UHF lead. A picoammeter is not listed as included.
Do I need a picoammeter with the Planck's Constant Apparatus?
Yes. The Planck's Constant Apparatus is ideally used in conjunction with a picoammeter, which reads the photocurrent through the female UHF socket. Please tell us if you need one, and we will advise on a suitable meter in our reply.
What light range does the Planck's Constant Apparatus respond to?
The caesium antimony photocell in the Planck's Constant Apparatus has a spectral response range of 185–650 nm. Six narrow-band filters, each with an FWHM bandwidth of 4–15 nm, select the light frequency; 405 nm is among the listed wavelengths.
How is the Planck's Constant Apparatus powered?
The Planck's Constant Apparatus runs on a 9 V PP3 battery, so no mains connection is needed at the bench. Keep a spare battery with the unit, and remove the battery if the apparatus will be stored for a long period.
How big is the Planck's Constant Apparatus?
The Planck's Constant Apparatus measures 205 x 150 x 115 mm (W x H x D). It is a compact bench unit that sits comfortably beside the light source and picoammeter on a normal laboratory table.
Who supplies the Planck's Constant Apparatus?
Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India, supplies the Planck's Constant Apparatus to schools, colleges and universities in India and international markets. Send your quantity and destination through our contact page for a quotation.
Request a Quote
Request a quotation for the Planck's Constant Apparatus on our contact page, or add it and any picoammeter requirement to the enquiry cart.
Last updated: 24 September 2026
