Question

The diameter of Earth is $1,27,56,000m$. Express the number in the standard form.

• A. $38.4\times {10}^{8}m$
• B. $1.2756\times {10}^{8}m$
• C. $1.2756\times {10}^{7}m$
• D. $1.2756m$

Answer 1

The correct option is C $1.2756\times {10}^{7}m$

A given number is said to be in a standard form if it can be expressed as $k\times {10}^n$, where $k$ is a real number such that $1\le k<10$ and $n$ is a positive integer.

Diameter of Earth $=1,27,56,000m$
$=1.2756\times {10}^{7}m$