Mounting plate with six colored light-emitting diodes with different emission wavelengths for determining Planck's constant h by measuring the cut-off voltage as a function of the frequency of the emitted light. Light-emitting diodes with series resistors mounted on a base plate with a stem. Specifications:
Made of grey cast iron, this base is used to mount stand rods
Item: U8611210
Universal power supply with digital current and voltage display.
Item: U33020
