The Weber fraction for a hawk's ability to see differences in brightness is about 1/100. About how much would the light have to change in order for a hawk to notice a brightness difference?

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Quizplus · Accepted Answer

The Weber fraction is a measure of the smallest detectable difference in stimulus intensity, expressed as a fraction or proportion of the original stimulus intensity. For a hawk, with a Weber fraction of 1/100, this means it can detect a change in brightness when the change is at least 1 percent of the original brightness level.

The Weber Fraction for a Hawk's Ability to See Differences