Question

Evaluate $\frac{6.3\times {10}^3}{3\times {10}^7}$

• A. $2\times {10}^{-3}$
• B. $2.1\times {10}^{-3}$
• C. $2.1\times {10}^{-4}$
• D. $2\times {10}^{-5}$

Answer 1

The correct option is C $2.1\times {10}^{-4}$

$\frac{6.3\times {10}^3}{3\times {10}^7}$

$\Rightarrow \frac{6.3}{3}\times {10}^{3-7}$

$\therefore 2.1\times {10}^{-4}$

Ans-Option $C$.