3. A 6-stage photomultiplier tube has a dark current of 2 nA. The secondary emission ratio of each dynode is 10 and the external quantum efficiency of the photocathode is 0.4.< (1) The electrons produced by the photocathode every second as the background noise.< (2) The minimum detectable optical power for 600-nm light if the signal-to-noise ratio is 1.<
3. A 6-stage photomultiplier tube has a dark current of 2 nA. The secondary emission ratio of each dynode is 10 and the external quantum efficiency of the photocathode is 0.4.< (1) The electrons produced by the photocathode every second as the background noise.< (2) The minimum detectable optical power for 600-nm light if the signal-to-noise ratio is 1.<
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Transcribed Image Text:3. A 6-stage photomultiplier tube has a dark current of 2 nA. The secondary emission
ratio of each dynode is 10 and the external quantum efficiency of the photocathode is
0.4.4
(1) The electrons produced by the photocathode every second as the background
noise.
(2) The minimum detectable optical power for 600-nm light if the signal-to-noise
ratio is 1.e
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