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Phototransistors have varying resistance from collector to emitter, depending on how much light strikes them.

True

Correct Answer: True

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More Questions from Counters

An asynchronous counter differs from a synchronous counter in the method of clocking.
When a J-K flip-flop is used in a circuit, we only have to consider the level at J and K at the active clock edge to know the states of the outputs.
The MOD number of a Johnson counter will always be equal to one-half the number of flip-flops in the counter.
In a synchronous counter, each state is clocked by the same pulse.
To design a divide-by-200 counter using synchronous counters, two 4-bit counters could be cascaded together to form an 8-bit counter.
Another term used to describe up/down counters is bidirectional.
A state diagram is a table of states.
All flip-flops in an asynchronous counter change states at the same time.
Cascade means to connect the Q output of one flip-flop to the clock input of the next.
The concept of a counter to implement a digital one-shot using HDL is not used.

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