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Q. The ratio of one micron to one nanometre is

Physical World, Units and Measurements

Solution:

$1$ micron $(1\, \mu m) = 10^{-6}\, m$
$1$ nanometre $(1 \,nm) = 10^{-9}\,m$
Their ratio is $\frac{\text{1 micron}}{\text{1 nanometre}}$
$=\frac{10^{-6}\,m}{10^{-9}\,m}=10^{3}$