We can see a candle flame at 50 kilometres on a clear,dark night,and we can hear the tick of a watch 7 metres away in a quiet room.These two facts are examples of:

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Quizplus · Accepted Answer

These are examples of absolute thresholds, which refer to the minimum amount of stimulation needed for a person to detect a sensory experience. In this case, the candle flame and tick of a watch represent the absolute threshold for vision and hearing, respectively.

We Can See a Candle Flame at 50 Kilometres on a Clear,dark