The number of significant figures in all the | vedclass

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(D) To determine the number of significant figures in each number:$1$. For $25.12$,all non-zero digits are significant,so there are $4$ significant fi

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$4$

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(D) To determine the number of significant figures in each number:$1$. For $25.12$,all non-zero digits are significant,so there are $4$ significant figures.$2$. For $2009$,all non-zero digits and the zeros between them are significant,so there are $4$ significant figures.$3$. For $4.156$,all non-zero digits are significant,so there are $4$ significant figures.$4$. For $1.217 	imes 10^{-4}$,the power of $10$ does not contribute to the significant figures. The digits $1, 2, 1, 7$ are significant,so there are $4$ significant figures.Thus,all the given numbers have $4$ significant figures.

The number of significant figures in all the given numbers $25.12, 2009, 4.156$ and $1.217 \times 10^{-4}$ is

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