The results of an electrochemical experiment are shown in the following figure.
ID: 894692 • Letter: T
Question
The results of an electrochemical experiment are shown in the following figure. In each case, a voltage is applied between two electrodes at time=20s and the absorbance of a solution decreases until the voltage is stepped back to its initial vales at times = 60s. The upper traces show the average results for 100, 300 and 1,000 repetitions of the experiment. The measured signal-terms noise ratio in the upper trace is 60.0.
Predict the SNR expected for 300, 100, and 1 cycles and compare your results to the observed values in the figure.
1 000 cycles SIN=60.0 Signal 300 cycles SIN = 35.9 100 cycles SIN = 20.9 1 cycle SIN = 1 .95 40 Time (s) 0 20 60 80Explanation / Answer
At 1000, 60.0
at 300, 32.9
at 100, 19.0
at 1, 1.90
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