Which unit is not for length a)parsec
b.light year c)angstrom d)nano?
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Nano is not a unit for length.
• There are metric prefixes which are used before the main unit to denote the multiple or fraction (based on 10) of the same main unit. (Eg. Centi,Kilo,Deca,Nano etc.)
• These individual metric prefixes are not units. We can call them units when a main unit is attached after them. Like, centi is not an unit but centimetre is an unit. Here,centi is metric prefix and metre is the main unit.
• Similarly,"Nano" is also not an unit of length. If a main unit of length,like metre is attached to this metric prefix,then it will become an unit (nanometre).
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Answer:
nano is not a unit of length
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