The required bandwidth of the preamplifier used in cell counter must be?

The required bandwidth of the preamplifier used in cell counter must be? Correct Answer 70 kHz

The electronic circuit must have upper frequency response greater than 70 kHz. The preamplifier used in cell counters must be of very low noise preferably having noise voltage less than 2 nA at the required bandwidth of 70 kHz.
Bissoy MCQ

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