Answer the following statement(s) true (T) or false (F)

1. Photodetectors have to make physical contact with the object they are sensing.
2. Photovoltaic cells cannot operate electrical equipment without external power.
3. Photoconductive devices exhibit a change of resistance due to the presence or absence of light.
4. The amount of voltage produced by a cell is determined by the material of which it is made.
5. Photodetectors that have both the transmitter and the receiver units mounted in the same housing depend on a reflector for operation.


1. False
2. False
3. True
4. True
5. True

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