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Q.

3 cm is equal to _________ nm.

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a

$3 \times 10^{6}$

b

$0.03 \times 10^{8}$

c

$0.003 \times 10^{8}$

d

$0.3 \times 10^{8}$

answer is B.

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Detailed Solution

$3 cm$

$3 \times 10^{- 2} m (1 cm = 10^{- 2} m)$

$3 \times 10^{- 2} \times 10^{9} \times 10^{- 9} m (nano = 10^{- 9})$

$3 \times 10^{- 2} \times 10^{0} nm$

${3×10}^{7} \times \frac{10}{10} nm= \frac{3}{10} \times 10^{8} nm = 0.3 \times 10^{8} nm$

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