According to Weber's Law, if a cup of coffee has five teaspoons of sugar in it, you will have to add _____ more before it will be noticeably sweeter.
A)one
B)two
C)three
D)five

Question

Quizplus · Accepted Answer

Weber's Law states that the just noticeable difference (JND) is a constant proportion of the original stimulus. In this case, the original stimulus is the sweetness of the coffee with five teaspoons of sugar. The JND is the amount of sugar that must be added to the coffee before the sweetness is noticeably different. Weber's Law states that the JND is a constant proportion of the original stimulus, so the JND in this case is 20% of the original sweetness. This means that one teaspoon of sugar must be added to the coffee before the sweetness is noticeably different.

According to Weber's Law, If a Cup of Coffee Has