The jnd value for weights is approximately 1/50.If you can lift a weight of 500 grams,a comparison weight must weigh at least _________ gram(s)more in order for you to be able to judge it as heavier.

Question

Quizplus · Accepted Answer

The formula for jnd value for weights is ΔW/W = 1/50. Therefore, ΔW = 1/50 x W. 
Substituting W = 500 grams, we get ΔW = 1/50 x 500 = 10 grams. This means that to judge a weight as heavier, a comparison weight must weigh at least 10 grams more. Hence, the correct answer is A) 1/50 x 500.

The Jnd Value for Weights Is Approximately 1/50