In making a large pot of chili for a family reunion, you find that you have to add 1 onion to your pot of chili that already has 5 onions mixed in it to notice a difference. According to Weber's Law, how many onions would you have to add to notice a difference if you are making twice as much chili with 10 onions?

Question

Quizplus · Accepted Answer

Weber's Law states that the just noticeable difference (JND) is proportional to the magnitude of the initial stimulus. Since you needed to add 1 onion to 5 to notice a difference, doubling the amount of chili (and thus the initial amount of onions to 10) requires you to double the change needed to notice a difference, which means adding 2 onions.

In Making a Large Pot of Chili for a Family