If we are able to detect that our 100 pound friend Julia has gained weight after she gains only 5 pounds, with a Weber fraction of 1/20, how much weight must our 200 pound friend Justin gain for us to notice?
A) 5 pounds
B) 10 pounds
C) 20 pounds
D) 50 pounds

Question

Quizplus · Accepted Answer

The Weber fraction is a constant ratio, in this case, 1/20. Since we notice a 5-pound gain on a 100-pound person, for a 200-pound person (twice as heavy), we would need to detect a weight gain twice as large, which is 10 pounds.

If We Are Able to Detect That Our 100 Pound