Question

Which unit is not for length?

• A. Parsec
• B. Light year
• C. Angstrom
• D. Nano

Answer 1

Answer: (D)

1 angstrom $=1\stackrel{\text{o}}{A}={10}^{-10}m$ 1 light year $=1ly=9.46\times {10}^{15}m$ 1 parsec = 3.26 light year Nano is a prefix 1 nano $={10}^{-9}m$