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Chapter 20: Q1P (page 525)
Describe the role of each component of the spectrophotometer.
Spectrophotometer: It is an optical instrument that measures intensity of light in relation to the wawelength.
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Describe three general types of noise that have a different dependence on frequency. Give an example of the source of each kind of noise.
What are the advantages and disadvantages of decreasing monochromator slit width?
Explain how the following detectors of visible radiation work: (a) photomultiplier tube, (b) photodiode array, (c) charge coupled device, and (d) image intensified charge coupled device.
Results of an electrochemical experiment are shown in the figure. In each case, a voltage is applied between two electrodes at timeand the absorbance of a solution decreases until the voltage is stepped back to its initial value at time. The upper traces show the average results for 100,300, and 1000 repetitions of the experiment. The measured signal-to-rms noise ratio in the upper trace is 60.0. Predict the signal-to-noise ratios expected for 300 cycles, 100 cycles, and 1 cycle and compare your answers with the observed values in the figure.
What is the role of a filter in a grating monochromator?
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