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 it took 1 additional onion to notice a difference in a pot with 5 onions, doubling the amount of chili (and onions) to 10 would require doubling the additional onions needed to notice a difference, making it 2 onions.

In Making a Large Pot of Chili for a Family