Q. The value of amu is which of the following?
A) $1.57 \times 10^{- 24}kg$
B) $1.66 \times 10^{- 24}kg$
C) $1.99 \times 10^{- 23}kg$
D) $1.66 \times 10^{- 27}kg$
Explanation
(d)
The amu represents atomic mass unit. It is used in place of unified mass unit.
$1\ u = 1\ Avogram = 1\ Aston = 1\ Dalton$
$1\ u = \ \frac{1}{12} \times mass\ of\ C - 12\ atom$
$= \frac{1}{12}\ \times 1.9924 \times 10^{- 23}\ g$
$= 1.66 \times 10^{- 24}\ g = 1.66 \times 10^{- 27}\ kg$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.