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Question

Evaluate $\frac{6.3 \times 10^{3}}{3 \times 10^{7}}$
$2 \times 10^{- 3}$
$2.1 \times 10^{- 3}$
$2.1 \times 10^{- 4}$
$2 \times 10^{- 5}$

A

2 \times 10^{- 3}

B

2.1 \times 10^{- 4}

C

2 \times 10^{- 5}

D

2.1 \times 10^{- 3}

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Solution

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

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

$∴ 2.1 \times 10^{- 4}$
Ans-Option $C$ .

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