Optical Phenomina

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Information about Optical Phenomina

Published on May 13, 2010

Author: kwarne

Source: slideshare.net


A set of slides created to teach Optical Phenomina to learners at Bishops Diocesan College in Cape Town.

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

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