This visually appealing device clearly illustrates the relationship between colour and wavelength
Seven coloured LEDs plus white, span the visible spectrum
Mounted in a robust vertical column, the LEDs can easily be viewed by a whole class
Depending on the diffraction grating used, first, second and third order fringes can be observed and used for calculations
The LED
line has a rotary switch to allow users to select and measure the voltage across each individual LED
Knowing these voltages and the wavelength for each LED, Planck's Constant can be determined
Students have a great opportunity to consider and minimise the sources of error in their experimental work
Explore the action of colour filters Demonstrate diffraction at different wavelengths Calculate the wavelength for each LED colour Measure the voltage across each LED and determine Planck's Constant graphically Compliant to EN61010‐2010 with certificates available on request
Teacher's notes are included on CD
5V Power supply included
To carry out all of the experiments described in the Teacher Notes, you will also need the following equipment:
