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 EN61010-110 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:
- Easy Read Meter (B8R02652)
- 1V D.C. Easy Read Attachment (B8H30919)
- Connecting Leads (B8R05705)
- Diffraction Gratings (B8A46231)
- Colour Filters (B8A46012)