According to Weber's Law 2 onions should be added to notice the difference.
The correct option is b. 2
<u>Explanation:</u>
Weber’s law deals with hypotheses in psychophysics. The law explains the relation between the actual change in a physical stimulus and the perceived change.
Weber’s law was proposed by a German philosopher Gustav Theodor Fechner. Fechner dealt with psychophysics and explains about human perception.
Regarding the question, if one onion is to be added to the pot of chili to notice the difference, then two onions will be required to add to notice the difference while making twice as much chili with 10 onions.
This machine was called the cotton gin
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Answer:
19554575040
Explanation:
The first five positions to be named as Grand Prize winners are not give any order.
Therefore, the number of ways they can be selected is


Now the remaining 5 positions are selected from the remaining 17 entries. So they can be ordered as,


17 x 16 x 15 x 14 x 13 ways of ordering
Therefore, the number of ways in which the entries can be announced is

= 19554575040 number of ways
Thus the announcement can be made in 19554575040 number of ways.