Analog Electronics
The major advantage of a photo transistor as compared to a photo diode is its

  increased sensitivity.
 durability.
 response to higher frequencies.
 AC operation.

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Analog Electronics
In an OP-amp differentiator

Output occurs when input is finite and constant
Polarity of input and output is the same
The amplitude of output is proportional to rate of change of input
The amplitude of output is proportional to input

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