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1A_experiment_H_spectrum - 309 LINE SPECTRUM OF HYDROGEN...

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309 LINE SPECTRUM OF HYDROGEN OBJECTIVES FOR THE EXPERIMENT The student will be able to do the following: 1. Calculate the frequencies and wavelengths for the light emitted in the first five transitions in the Balmer series for hydrogen. 2. Experimentally determine degree of diffraction reading for light sources using a spectroscope. 3. Determine wavelengths from experimental degree of diffraction readings and a graph of degree of diffraction vs. wavelength. 4. Calculate percent error. BACKGROUND The purpose of the experiment is to study the Balmer Series of the line spectrum of hydrogen. This is the portion of the line spectrum of hydrogen that lies in the visible range. The wavelengths for this series will be determined in two ways. 1. The actual wavelengths for the first five transitions in the Balmer Series will be calculated using the Rydberg equation and the relationship between frequency and wavelength. ν = frequency R = 3.289 x 10 15 s - 1 n high = 3,4,5, .... c = speed of light = 2.9979 x 10 8 m/s 2. Three or four of the wavelengths for the lines in the hydrogen spectrum will also be determined experimentally using a hydrogen light source and a spectroscope. The spectroscopes used in the experiment do not register the position of the lines in terms of wavelength but in terms of degree of diffraction. Different diffraction gratings will yield different angles of diffraction, so each spectroscope will give slightly different angles for the same wavelengths. To obtain the wavelengths, we must first set up a calibration graph for your spectroscope so that the degrees can be converted to wavelengths.
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