Suppose you can just tell the difference between lifting 100 grams and 102 grams. According to Weber's law, you would need to add __________ grams to tell the new weight from a standard weight of 1,000 grams.
A) 2
B) 10
C) 20
D) 100

Question

Quizplus · Accepted Answer

Weber's law states that the just noticeable difference (JND) is a constant proportion of the original stimulus. Since you can tell the difference between 100 and 102 grams, the JND is 2/100 or 1/50. Applying this ratio to a 1,000-gram weight, the amount needed to notice a difference would be 1/50 of 1,000 grams, which is 20 grams.

Suppose You Can Just Tell the Difference Between Lifting 100