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Apparatus for Determining Planck's Constant



0 ~ 3000 Get Latest Price



1 Unit


3-4 weeks

10 Unit per Month


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Product Description



  • More accurate measurement results by using micro current meter

  • Integrated structure and easy to operate

  • No crosstalk between spectral lines

  • No background current




This LEAI-52 experimental apparatus for determining Planck's constant is used to demonstrate the photoelectric effect, measure the characteristic curve of a photoelectric tube, verify the existence of "red limit" frequency, and calculate the Plancks constant according to the Einsteins equation of photoelectric effect. By adding optional modules of photocell, photoresistor and photodiode, current-voltage characteristics and other properties of these photoelectric devices can be measured. It is an ideal teaching apparatus for physics laboratories at colleges and universities.




Description Specifications
Wavelength of filters 365 nm, 405 nm, 436 nm, 546 nm, 577 nm
Light source 50 W Mercury lamp


Wavelength range: 340 ~ 700 nm
Cathode sensitivity: ≥1 µA (-2 V≤UKA≤0 V)
Anode dark current: ≤5×10-12 A (-2 V≤UKA≤0 V)
Current measurement range 10-7 ~ 10-13 A, 3-1/2 digit display
Phototube power supply I: -2 ~ +2 V; II: -2 ~ +20 V, 3-1/2 digit display, stability ≤0.1 %
Zero drift < ±0.2% of full scale (for scale 10-13 A) within 30 minutes after warm-up
Measurement method Zero current method and compensation method
Measurement error 3%


Parts List


Description Qty
Main Unit 1
Electric Control Unit 1
Cable 2
Photocell Module (size 10 mm × 10 mm, load potentiometer 10 kΩ )

1 each (optional)

Photoresistor Module (dark resistance 30 kΩ)
Photoresistor Module (dark resistance 30 kΩ)
Power Cord 1
Instruction Manual 1
Apparatus for Determining Planck's Constant

Contact Us

Contact Person :Mr. James

Company:Lambda Scientific Systems, Inc.

Address:16300 SW 137th Ave, Miami, Florida, USA,33177


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