J14.03.03-C3 Planck’s Constant Measuring Instrument
This instrument can carry on the experiment about the rule of photoelectric effect, and calculate Planck’s constant according to Einstein’s equation of photoelectric effect.
Satisfying the students’ grouping experiments, the instrument has features such as compact structure, fastness, convenient operating, steady performance, cheap and convenient service etc.
The anode of phototube is not shined directly, so the reverse current is small.

□ Color filter: 635nm, 570nm, 540nm, 500nm, 460nm
□ Sensitive component: vacuum phototube
□ Dark-current: ≤0.003uA
□ Light source: 12V/35W halogen tungsten lamp
□ Length of guide: 395mm
□ Precision of accelerate voltage: ≤2%
□ Measuring error: less than ± l5% compared with the recognized value (h=6.62619x l034J.S)