Question

The general form of scientific notation can be written as $a\times {10}^n$, where n is an integer. Find the range of a.

• A. $1<a\le 10$
• B. $1\le a<10$
• C. $1\le a\le 5$
• D. $1<a<10$

Answer 1

The correct option is B $1\le a<10$

The general form of scientific notation can be written as
$a\times {10}^n$, where $1\le a<10$ and $n$ is an integer.

For example, the scientific notation of 78000.0 is $7.8\times {10}^4$(moving the decimal point 4 places to the left) and not $78\times {10}^3$ because 78 does not lie in between 1 and 10.