Diffraction Gratings Diffraction Grating Analysis

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Presentation transcript:

Diffraction Gratings Diffraction Grating Analysis Diffraction Grating vs. Double Slit Double vs. Multi slit The Grating Equation Types of Diffraction Grating Light source and grating Spectroscope Application – Spectral Analysis Application – DVD’s and CD’s

Diffraction Grating A diffraction grating is a device used for wave analysis, ________________

TeachWithFergy Preview File Please enjoy this preview of your Student Version of the Power Point. Some slides appear blank because they have been removed. Student versions have portions of the text removed which is given in the teacher version and appear as ______ Other slides may have ........... on them, this represents writing that has been removed. Please note that the Entire Unit Package can also be purchased at a steep discount from my Store.

Diffraction Grating vs. Double Slit Similar to the double slit except: Grating has more slits  increased light passing through  brighter interference pattern The maximas are sharper and narrower in grating ________

Double Slit vs. Multi Slit Interference pattern becomes brighter and sharper. Maxima become narrower and more spread out.

Double Slit vs. Multi Slit Diffraction Grating _________

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The Grating Equation d = distance between slits λ = wavelength Θ = emergent angle. Different wavelengths will have different Θ. m = ……………...

The Grating Equation Constructive interference (solid bands) occurs when m = an integer (positive or negative whole number, no fractions). When fractions occur, you get destructive interference and therefore, no bright spot  ___________ Different wavelengths will diffract ……………….

Check Your Understanding At what angle will 638 nm light produce a second-order maximum when passing through a grating of 900 lines/cm?

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Check Your Understanding A diffraction grating with slits 1.00 x 10-5 m apart is illuminated by monochromatic light with a wavelength of 6.00 x 102 nm. Calculate the angle of the third-order maximum.

Types of Diffraction Grating Transmission Grating The light passes through the slits Reflection ________

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White Light and Grating If the light striking the grating is not monochromatic but a mixture of wavelengths, each wavelength produces a pattern of bright maxima at different locations on the viewing screen

Spectroscope _________

__________ Can be used to determine the atomic makeup of distant objects as different atoms give off different spectrums of light which can be analyzed

DVD’s and CD’s The tracks of a CD or DVD act as a reflection diffraction grating, producing a separation of the colors of white light. The nominal track separation on a CD is 1.6 micrometers, corresponding to about 625 tracks per millimeter. For red light ………………..