Question

which of the following expressions is written in scientific notation? 0.3 • 104 2 • 10-5 10 • 103 12 • 10-3

Answer 1

Answer:

option (2) is correct.

$2 \cdot 10^{-5}$ is in the scientific notation form.

Step-by-step explanation:

Given: Some expressions

$1) \ 0.3 \cdot 10^4\\\\ 2) \ 2 \cdot 10^{-5}\\\\ 3) \ 10 \cdot 10^3\\\\ 4) \ 12 \cdot 10^{-3}$

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  $a\cdot 10^{n}$ , 1 ≤ a < 10 and n is integer.

Thus, out of given only $2 \cdot 10^{-5}$ is in the scientific notation form.

Thus, option (2) is correct.