Question

Express the answer in scientific notation & observe significant figure rules. (1.8 x 10-2) ÷ (9 x 102) =

Answer 1

(1.8×10^−2)÷(9×10^2)

(1.8×10^−2) / (9×10^2)

(18×10^−3) / (9×10^2)

(2.0×10^−3) / (10^2)

2.0×10^−3−2

Answer: 2.0×10^−5

Answer 2

Answer : The correct answer is, $2.0\times 10^{-5}$

Explanation :

The rule apply for the multiplication and division is :

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

As we are given :

$(1.8\times10^{-2})\div (9\times 10^2)$

$=2.0\times 10^{-5}$

In this problem, the least number of significant figures is 2.

So, the correct answer is, $2.0\times 10^{-5}$