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Physics II Lab w answers_Part_67

Physics II Lab w answers_Part_67 - Experiment 23...

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145 Experiment 23 Diffraction Grating Apparatus Spectrometer, grating, sodium lamp, mercury lamp, power supply for spetral lamps, magnifying glass. Objective of the experiment: a. To calibrate the grating spectrometer using the known source (Hg source) of light and to calculate the grating constant. b. Using the same grating, to calculate the wavelength of sodium –D lines Basic methodology: Light from a mercury lamp source is made to fall normally on a grating mounted on a spectrometer. The diffraction angle of the diffracted light is measured for each spectral line of the Hg-source. Likewise for sodium source, the diffraction angle and angular separation Δθ of the sodium doublet is measured. I. Introduction I.1 Diffraction grating A diffraction grating is a very powerful and precise instrument for the study of spectra and is widely used in a large number of fields from Astronomy to Engineering, wherever there is a need for detection of the presence of atomic elements.
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