PLANCK’S CONSTANT APPARATUS SIMPLE

Description

SP4-1988
To determine Planck’s Constant, it is necessary to measure the energy level of the photons of light of different wavelengths (or colours). Traditionally, this involves a ‘photo
tube’ and the energy levels of electrons are measured.
In this instrument, voltage is applied to each of 7 LEDs to
cause each to just conduct. The value of the voltage to
begin current to flow relates to the energy of the photon of
that wavelength.
7 readings, including 2x Infra Red, are taken and the graph
is then plotted as normal to determine Planck’s Constant.
The method is not as fundamental as using a ‘photo tube’
but the results are good and price is much lower.
SP4-1988