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ALEX Podcasts


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How to Use a Compound Light Microscope
Overview:
This is a three minute demonstration of how to use a compound light microscope.  This podcast should follow a lesson which focuses on the identification of the parts of a microscope.  This podcast would be appropriate for students who are using a microscope for the first time.


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Einstein Demonstrations- Light Defraction
Overview:
This demonstration exhibits light’s wave-like characteristics. This is half of light’s duality; the other half being light’s particle-like characteristics. Using diffraction gratings we can compare the visible parts of atomic spectra for different elements. A diffraction grating consists of a large number of equally spaced parallel slits. These slits bend light differently according to wavelength. Incandescent lights work by heating a solid piece of tungsten wire. This heating of a solid produces a variety of wavelengths, giving an impressive spread of colors when viewed with a diffraction grating. Since the other lamps are single gaseous elements, they emit only a few wavelengths of light, their individual atomic spectra.


Thinkfinity Podcasts


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Subject: Health, Science
Title: Reading in the Dark     
Description: In this Science Update, from Science NetLinks, you'll hear about the possible effects of reading in low light. Science Updates are audio interviews with scientists and are accompanied by a set of questions as well as links to related Science NetLinks lessons and other related resources.
Thinkfinity Partner: Science NetLinks
Grade Span: 3,4,5,6,7,8,9,10,11,12



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