Q. Which of the following practical units of length is not correct?

1958 228 Physical World, Units and Measurements Report Error

A

1 fermi $= 1 0^{- 15} m$

B

1 astronomical unit $= 1.496 \times 1 0^{11} m$

C

1 parsec $= 3.26$ light year

D

1 light year $= 9.46 \times 1 0^{12} m$

Solution:

1 light year $= 9.46 \times 1 0^{15} m$