![]() According to Grossie and Underwood, the slot is an entrance slit that allows 1mm of light beam to pass into the box and hits diffraction grating at an incidence angle of 30° (287). The spectroscope comprised of the cigar box, which has a slot, a source of light, a diffraction grating, and a graph-paper scale. The experiment used spectroscope to determine wavelengths of the visible colors. To determine unknown wavelengths using standard wavelengths, calibration plot is necessary. If the angle of diffraction (θ) and the distance between lines on a diffraction grating (d) are known, then one can calculate the wavelength using the equation (λ = dsinθ). The diffraction grating then diffracts the stream of light and separates it into atomic spectra according to their respective wavelengths. Spectroscope measures atomic spectra by generating a stream of light using a slit (entrance slit).Īfter generating stream of light using entrance slit, spectroscope then allows the stream of light to pass through diffraction grating (lens or prism). To measure atomic spectra, spectroscope is necessary. Since the change of quantum levels is intermittent, there is an emission of light in form of spectral lines. For example, when atoms or ions gain energy in the form of heat, electrons in them changes their quantum levels from ground state to an excited state. The formation of the atomic spectra occurs when atoms or ions intermittently absorb and emit energy due to the excitation of the electrons. ![]()
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