Answer / haris.k.a

1. Small area
2. No internal gain (except avalanche photodiodes, but
their gain is typically 102–103 compared to up to 108 for
the photomultiplier)
3. Much lower overall sensitivity
4. Photon counting only possible with specially designed,
usually cooled photodiodes, with special electronic circuits
5. Response time for many designs is slower

in human body which current flow? ac or dc and how

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