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  4. The respective number of significant figures for the numbers 23.023, 0.0003 and 2.1 × 10-3 are

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Q. The respective number of significant figures for the numbers $23.023$, $0.0003$ and $2.1 \times 10^{-3}$ are

AIEEEAIEEE 2010Physical World, Units and Measurements

Solution:

Rule : I. All non zero digits are significant.
Rule : II. If zero is between two non-zero digits, then it is also significant.
Rule : III. If zero left to the non-zero digit, then it is non significant. Significant figures for number $23.023$ is $5$ (Using $I$ and $II$ Significant figures for number $0.0003$ is $1$ (Using $I$, $II$ and $III$).
Significant figures for number $2.1 \times 10^{-3}$ is $2$ (Using $I$).