Photoelectric-Effect Apparatus
Product Code : SCL-PL-12387
Photoelectric-Effect Apparatus (SKU SCL-PL-12387) lets students measure the photocurrent and stopping voltage of a vacuum phototube lit through five narrow-band filters, and so determine Planck's constant. It is designed for Class 12 modern physics and B.Sc. and engineering physics laboratories. Science Lab Supplies manufactures the apparatus at its Plot 448 factory in the HSIIDC Industrial Area, Saha, Ambala, India, and quotes it directly to colleges, schools, tender contractors and distributors.
Specifications
A 20 W tungsten-halogen lamp and a vacuum phototube sit on a 500 mm anodized aluminium alloy rail, with a filter wheel of five interference filters between them. The control unit supplies 0–10 V and measures current in the nanoampere to microampere range.
| Parameter | Value |
|---|---|
| SKU | SCL-PL-12387 |
| Light source | Tungsten-halogen lamp with holder, 20 W |
| Detector | Vacuum phototube in housing, with holder |
| Filters | 5 narrow-band interference filters on a wheel: 404, 450, 505, 546 and 578 nm |
| Optical rail | 500 mm, with lamp socket, circular filter and phototube housing |
| Rail material | Anodized aluminium alloy |
| Control unit | 0–10 V; nano/microampere current measurement; adjustable source |
| Accessories | Dust cover and manual |
| Manufacturer | Science Lab Supplies, Saha, Ambala, Haryana |
| Country of origin | India |
Applications and Experiments for the Photoelectric-Effect Apparatus
The apparatus shows that photoelectron energy depends on light frequency, not intensity. Students record the stopping voltage for each filter wavelength, plot it against frequency, and take Planck's constant from the slope and the work function from the intercept, as in Class 12 and B.Sc. modern physics.
- Class 12 physics (dual nature of radiation and matter): stopping potential against frequency.
- B.Sc. and B.Tech engineering physics: determination of Planck’s constant.
- Photocurrent against applied voltage at a fixed wavelength and intensity.
The halogen lamp gets hot in use; let it cool before handling, and fit the dust cover for storage.
Standard Scope of Supply
The apparatus is supplied with the 20 W tungsten-halogen lamp and holder, the vacuum phototube in its housing, the filter wheel with five interference filters, the 500 mm optical rail, the control unit for voltage and current, a dust cover and a manual.
Packing, MOQ and Lead Time
Request a quotation for one apparatus for a modern-physics bench or several for a larger laboratory. As a physics instruments supplier in India, Science Lab Supplies confirms packing, delivery time and price for that quantity, and other physics lab equipment can be quoted with it.
The company has an Importer-Exporter Code and is able to ship to buyers in Kenya, Ghana, Ethiopia, Tanzania, Uganda and the UAE. To enquire, use the contact page or place the item in the enquiry cart; tender buyers may prefer the lab tender page.
Frequently Asked Questions
What can be measured with the photoelectric-effect apparatus?
It measures the photocurrent from a vacuum phototube and the voltage that stops it, at five wavelengths from 404 to 578 nm, from which students determine Planck’s constant and the work function.
Which filter wavelengths are included?
The filter wheel holds five narrow-band interference filters at 404, 450, 505, 546 and 578 nm, one of each, to select the light reaching the phototube.
Is Science Lab Supplies the manufacturer or a trader?
Science Lab Supplies is the manufacturer and builds this apparatus at its own factory in Saha, Ambala, India, so colleges and contractors receive quotations from the maker with no trading layer in between.
Which course level is it suitable for?
It suits Class 12 photoelectric-effect practicals and the modern-physics experiments of B.Sc. and engineering physics laboratories, where Planck’s constant is found from the stopping-voltage readings taken.
Related Modern Physics Apparatus
These four Physics Lab items support a modern-physics laboratory: gas spectra, electron deflection for the e/m ratio, diffraction gratings for wavelength measurement and a radiation detector. With the photoelectric apparatus they show how light and matter interact, on one quotation.
- Spectral Tubes — for observing line and band spectra of gases.
- E/M Set, Deflection of Electrons by a Magnetic or Electric Field — Thomson experiment and e/m ratio.
- Diffraction Gratings with Holder — 100, 300 and 600 lines/mm gratings.
- Geiger Muller Tube — detector for alpha, beta and gamma radiation.
Browse the full Physics Lab range or all physics lab equipment.
Last updated: 25 September 2026
