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Name the three convenient units used to ...

Name the three convenient units used to measure length ranging from very short to very long value. How are they related to the S.I. unit?

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Three convenient units used to measure lengths ranging from very short to very large value:
(i) 1 Angstrom (Å) = `10^(-10)` m [used to measure very short length]
(ii) 1 kilometre (km) = `10^3` m
(iii) 1 light year (ly) = `9.46 xx 10^15` m [used to measure very large value]
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