Q. The respective number of significant figures for the numbers 23.02310.0003 and $2.1 \times 10^{- 3}$ are
A) 5, 1, 2
B) 5, 1, 5
C) 5, 5, 2
D) 4, 4, 2
Explanation
The number of significant figures in 23.023 = 5. The number of significant figures in 0.0003 = 1 (Zeros after decimal and before a non-zero number are not significant.) The number of significant figures in $2.1 \times 10^{- 3} = 2$ (zero in powers of are not counted) (All the zeros between two non-zero numbers are significant).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.