Answer: [tex] 10^{-4} [/tex]
To answer this question you need to understand how much power of 10 works. In "0.0001" there is 4 number on the right of the zero. For every number on the right of zero would mean a [tex] 10^{-1} [/tex] and for every number on the left of zero would mean a [tex] 10^{1} [/tex] . Since there are 4 of them, the answer is [tex] 10^{-4} [/tex]