Answer :
1) The minimum increase he would notice a difference according to the Weber fraction is 4 lb.
2) The Weber fraction for brightness is 1/60.
The Weber fraction is a constant that represents the smallest noticeable difference in a stimulus compared to its original intensity. It is calculated by dividing the difference threshold by the original stimulus intensity. In other words, the Weber fraction is the ratio of the change in intensity to the initial intensity that a person can detect.
(1) For weight, the Weber fraction is 1:40. This means that Philart would notice a difference in weight if the increase is greater than or equal to 1/40 of the original weight. So, if Philart is benching a 160-lbs barbell, the minimum increase he would notice a difference would be 4 lbs, which is calculated by dividing 160 by 40.
(2) The Weber fraction for brightness can be calculated using the same formula. If the difference in the brightness of 122 lights is just detectable from the brightness emitted by 120 lights, then the minimum noticeable difference is 2 lights.
Thus, the Weber fraction for brightness is calculated by dividing 2 by 120, which is 1:60. This means that a change in brightness must be greater than or equal to 1/60 of the original brightness to be noticeable.
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