![]() The Spectrometer comes with a prism and a diffraction grating. It is fitted with a diffraction grating holder of aperture 1″ (25 mm) x 1″ (25 mm) and a clamp for holding prisms up to 1.5″ (38 mm) high. This item has lines and concentric rings marked to assist in positioning the prism in relation to leveled screws. is held with the help of a clamping screw which enables the table to be rotated in any direction. The collimator slit 0.25″ (6 mm) long is specially designed for retention of initial accuracy during the life of the instrument. The fact we hear sounds around corners and around barriers involves both diffraction and reflection of sound. The focusing is refined by a concealed rack and pinion. This happened due to diffraction of sound. Both the telescope and the collimator are fitted with coated achromatic objectives of 7″ (178 mm) focal length and 1.25″ (32 mm) Dia., providing light for a brighter and sharper image. The telescope has a 10X Ramsden eyepiece and is fitted with a cross hair reticle. Both the collimator and the telescope are mounted with an axis adjustment system. As with the diffraction in the substrate, the geometry of the system dictates that the particles are within the near-field of the sound field, in this region. Because low frequencies have longer wavelengths, they can bend around obstacles much easier than high frequencies. We also learned that low frequencies tend to diffract easier than high frequencies. Fine adjustment is accomplished by using a knob while coarse adjustment can be done by hand. As studied earlier in the semester, diffraction is the bending and spreading out of sound waves around obstacles or corners. ![]() This plate has a double-ended vernier for more accurate measurements. The telescope arm moves along a fixed circular plate 6″ (150 mm) Dia., graduated in degrees (0-360 x 1). ![]() The Spectrometer consists of a heavy cast base and a pillar for collimator support. It is similar to a Student Spectrometer but it has enhanced features for obtaining better quantitative results. It can also be used for quantitative spectrometric measurement of angle of prism and refractive index of the prism material. Use our Spectrometer for introducing students to principal types of spectra and determination of the wavelength and frequency of emitted light. ![]()
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