Answer:
option (2) is correct.
[tex]2 \cdot 10^{-5}[/tex] is in the scientific notation form.
Step-by-step explanation:
Given: Some expressions
[tex]1) \ 0.3 \cdot 10^4\\\\ 2) \ 2 \cdot 10^{-5}\\\\ 3) \ 10 \cdot 10^3\\\\ 4) \ 12 \cdot 10^{-3}\\\\[/tex]
We have to choose which expressions is written in scientific notation.
For an expression to be in scientific notation the most important requirement is that the whole number is between 1 and 10, but not including 10.
that is [tex]a\cdot 10^{n}[/tex] , 1 ≤ a < 10 and n is integer.
Thus, out of given only [tex]2 \cdot 10^{-5}[/tex] is in the scientific notation form.
Thus, option (2) is correct.
