Through some tasty culinary investigation,Chef Willie has found the difference threshold for the sweetness of sugar in a cake.For a cake with 100 mg of sugar,the difference threshold is 5 mg.Based on this information,how much sugar would need to be added to a cake already con- taining 250 mg of sugar in order to make it taste just noticeably sweeter.(Assume Weber's law applies. )
A)5 mg
B)10 mg
C)12.5 mg

Question

Quizplus · Accepted Answer

Weber's law states that the just noticeable difference (JND) is a constant proportion of the original stimulus. Since the difference threshold for 100 mg of sugar is 5 mg (5% of 100 mg), for 250 mg of sugar, the JND would also be 5% of 250 mg, which is 12.5 mg.

Through Some Tasty Culinary Investigation,Chef Willie Has Found the Difference