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Name four units to measure extremely sma...

Name four units to measure extremely small distances.

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Units used to measure extremely small distances are
(i) 1 micron or micrometer `1 mu m=10^(-6)` m
(ii) 1 nanometer, `1 nm =10^(-9)m`
(iii) 1 Angstrom unit `1 Å=10^(-10)m`
(iv) 1 Fermi, 1 `Fm=10^(-15)m`
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