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18 pattern
This will be especially helpful for encouraging children to recall their times tables quickly
child-friendly tubes are permanently sealed
24 x Coloured Tennis Balls
The efficiency is very low
Planck S Constant Kit Clearance 18 patternPlank's Constant kit can be used: As a direct method that gives a reasonable order of magnitude value for Plancks constant, h For the demonstration of photoelectric effect and the principle of applying a backing p. d. to reduce anode current to zero The Plancks Constant Kit contains a photoelectronic unit, with six colour filters and a BNC to 4mm plug lead. The main unit contains a photoemissive Caesium Antimony cathode, with a spectral response of
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