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SOLUTION TO EXERCISE 2
We are counting photons in this experiment, so we can use Poisson statistics. The noise is the square root of the signal plus the background. Thus, (a) S/N = 500 / sqrt(500) = 22 (b) S/N = 500 / sqrt(500+500) = 16 (c) S/N = 500 / sqrt(500+5000) = 6.7 |