Hint Sort the following statements based on whether they describe the use of a filter or a monochromator for wavelength selection in a spectroscopic instrument. Filter Monochromator Can continuously vary the wavelength Fixed or infrequent wavelength changes High resolution wavelength selection Used for quantitative purposes only Low Cost Rugged Used for both qualitative and quantitative purposes Low resolution wavelength selection Simple Design Previous Check Answer Next A monochromator uses a grating to disperse the radiation into its component wavelengths. By rotating the grating, different wavelengths are passed through the exit slit. Filters used in spectroscopic instruments are typically interference filters which use destructive interference to remove radiation outside the transmitted radiation bandwidth.