## Multimedia

### Einstein Demonstrations- Light Defraction

This podcast is part of the series: Einstein Demonstrations

Creator:

McWane Science Center

School/Organization:

McWane Science Center

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.

Length: 03:36

Content Areas: Science

Alabama Course of Study Alignments and/or Professional Development Standard Alignments:

 SC (4) 3. Recognize how light interacts with transparent, translucent, and opaque materials. Examples: transparent—most light passes through, translucent—some light passes through, opaque—no light passes through Predicting the reflection or absorption of light by various objects SC (5) 5. Contrast ways in which light rays are bent by concave and convex lenses. Describing how a prism forms a visible spectrum Explaining why different objects have different colors Describing how mirrors reflect light Example: discussing differences in the reflection of light by convex and concave mirrors Describing the relationship between the structure of the eye and sight Identifying types of corrective lenses used to correct different sight problems Examples: convex—farsightedness, concave—nearsightedness Identifying the contribution of van Leeuwenhoek to the development of the microscope SC (8) 12. Classify waves as mechanical or electromagnetic. Examples: mechanical—earthquake waves; electromagnetic—ultraviolet light waves, visible light waves Describing how earthquake waves, sound waves, water waves, and electromagnetic waves can be destructive or beneficial due to the transfer of energy Describing longitudinal and transverse waves Describing how waves travel through different media Relating wavelength, frequency, and amplitude to energy Describing the electromagnetic spectrum in terms of frequencies Example: electromagnetic spectrum in increasing frequencies—microwaves, infrared light, visible light, ultraviolet light, X rays SC2015 (4) 6. Develop a model of waves to describe patterns in terms of amplitude and wavelength, and including that waves can cause objects to move. SC2015 (4) 8. Construct a model to explain that an object can be seen when light reflected from its surface enters the eyes. SC2015 (8) Physical Science 17. Create and manipulate a model of a simple wave to predict and describe the relationships between wave properties (e.g., frequency, amplitude, wavelength) and energy. a. Analyze and interpret data to illustrate an electromagnetic spectrum.