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Unformatted text preview: PHY251 - Hydrogen Spectrum PHY 251 Emission Spectrum of Hydrogen Introduction In this experiment you will measure the visible part of the hydrogen spectrum, the Balmer series, and determine the Rydberg constant R y . If parallel rays of light are incident perpendicularly to the plane of a diffraction grating, with uniform phase over the grating, then one will observe a diffraction pattern which will have a series of intensity maxima at angles satisfying the equation n = d sin , n = 0, 1, 2,... where is the wavelength of the emitted light, and d is spacing between adjacent grooves on the grating. Thus the grating will allow a determination of an unknown wavelength if the positions of the intensity maxima are measured and d is known. Apparatus The means for mounting the grating, obtaining parallel rays and measuring the positions of the maxima are provided by the spectrometer table, indicated in the Figure. Light from the source passes through a collimator which consists of a vertical slit and lens. With proper adjustment the collimator can be made collimator which consists of a vertical slit and lens....
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