Photo Electric Apparatus Manufacturer,Supplier and Exporter in India
Product Code : EL-PL-12604
Jlab Export is a leading Photo Electric Apparatus Manufacturer,and suppliers in India
Photo Electric Apparatus (code EL-PL-12604) is a bench set-up for the photoelectric effect and Planck’s constant: a 20 W tungsten halogen lamp, a wheel of five interference filters from 404 to 578 nm and a vacuum phototube are aligned on a 500 mm aluminium rail. A control unit measures the photocurrent in the nano- to microampere range. JLab manufactures the apparatus in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Model | JLK1055/061 |
| Light source | Tungsten halogen lamp with mount, 20 W |
| Filters | Filter wheel with five narrow-band interference filters: 404, 450, 505, 546 and 578 nm |
| Detector | Vacuum phototube in tube housing, with mount |
| Optical rail | Rail-based platform, 500 mm, anodised aluminium alloy |
| Control unit | Voltage 0–10 V; current in the nano- to microampere range |
| Regulated supply | 0–2 V variable, with ammeter and toggle switch |
| Accessories | Dust protector cover, user manual |
| Quality check | Each apparatus is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 1 unit |
| Dispatch time | Usually 7–10 working days |
| Product code | EL-PL-12604 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
Measuring Planck’s Constant
Light through each filter releases electrons from the phototube cathode. Raising the retarding voltage until the photocurrent just falls to zero gives the stopping potential V0 for that wavelength, because eV0 = hf − φ, with f = c/λ. Plotting V0 against frequency for the five filters gives a straight line of slope h/e, so Planck’s constant follows from the slope; where the line meets the frequency axis marks the threshold frequency, and h times that frequency is the work function φ of the cathode.
Set-up and Care
The lamp house, filter wheel and phototube housing all sit on the rail, so the light path stays in line while filters are changed. Let the lamp warm up before readings so its output is steady, and fit the dust protector cover after use to keep the filters and phototube clean.
Related Photoelectric Apparatus
- Photo Cell Mounted on Base — vacuum-type photo cell in a housing for Planck’s constant work.
- App. to determine Inverse Square Law in Photo Cell — relates photocell output to distance from a lamp.
More modern physics apparatus is in Physics Lab.
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Last updated: 26 October 2026
