Published on May 13, 2010
Optical Phenomena K Warne
Absorbing light When a photon of light is incident on a molecule it can cause the molecule to vibrate in any of a number of ways. When this occurs the photon would transfer its energy to the molecule and the of photon of light (disappears). The light has effectively been absorbed by the molecule. The increased vibrations of the molecule are evident as an increase in the temperature of HEAT! the gas and surrounding atmosphere. Gases in the atmosphere are therefore effective in trapping the energy from the SAMPLE ONLY sun and contribute to global warming. SAMPLE ONLY
Atomic SpectraCONTINIOUS SPECTRUMLight from a hot object passingthrough a prism forms acontinuous spectrum.LINE EMISSION SPECTRUMA gas that is energised (heatedor electrically charged) can emitlight.If this light is viewed through aprism specific colour lines are seenas AN LINE EMISSIONSPECTRUM .LINE ABSORPTIONSPECTRUMIf light is shone through a coldsample of a gas, the same specific Prisim OR diffractioncolour lines are absorbed and grating – makes notherefore absent and appear as an difference! SAMPLE ONLY SAMPLE ONLYABSORPTION LINE
Emission spectrum Electrical, heat or light energy ENERGY - (emitted) In EMISSION spectrum radiation is EMITTED by electrons dropping to lower energy levels. SAMPLE ONLY SAMPLE ONLY
Emission SpectrumExcited electrons droppingdown from unstable energylevels radiate energy in the form oflight.The frequency (colour) of theradiation is directly related to theenergy gap between the energylevels.Since each element has its ownunique series of energy levels,each element also has its ownunique series ofemission/absorption lines.The line spectrum can therefore beused to identify each elementmuch like a fingerprint. SAMPLE ONLY SAMPLE ONLY
Photoelectric effect Light can cause electrons to be ………………from a metal. The light must have a frequency above a particular frequency – the ……………… frequency. Increasing the energy (frequency) of the light emits electrons with higher …………….. (kinetic). Increasing the intensity of the light increases the ……………. of electrons released (current). SAMPLE ONLY SAMPLE ONLY
Keith Warne This is a SAMPLE presentation only The full presentations contain loads more slides (20-100) and are available on the click2learn website here http://www.click2learn.co.za/shop/lessoncloud-grade-12-science-slides/ (paste into your browser if link above does not work) I have other resources available from my Science Café site feel free to have a look SAMPLE ONLY SAMPLE ONLY
Optical phenomena are any observable events that result from the interaction of light and matter. See also list of optical topics and optics. A mirage is ...
Related WordsSynonymsLegend: Switch to new thesaurus Noun 1. optical phenomenon - a physical phenomenon related to or involving light physical phenomenon ...
This huge collection of 129 non-scary optical illusions and fascinating visual phenomena emphasizes interactive exploration, beauty, and scientific ...
Halo (optical phenomenon) This article needs ... Other common optical phenomena involving water droplets rather than ice crystals include the glory ...
OPTICAL PHENOMENA IN GEMS: Optical phenomena encompass the light-dependent properties of a gem, which are not due to its basic chemical ...
Though she had some indistinct idea of the method of these optical phenomena, still the illusion was almost perfect enough to warrant the belief that her ...
2 Atmospheric Optical Phenomena are produced by the reflection, refraction, dispersion and scattering / diffusion of rays of sunlight.
"A fascinating consequence of optical coherence, speckle has become one of the major optical phenomena. Most often, but not necessarily always, ...
Atmospheric Phenomena Unusual phenomena around the World. Home; ... due to wave-optical effects. This shift was also noted in the analysis of the ...
Learn about the many Optical Phenomena of Colored Stones ? Color Change, Tenebrescence, Aventurescence, Labradorescence, Opalescence, Adularescence and More.