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  4. The length of a wire is 2.17 cm and radius is 0.46 cm. The number of significant digits in the value of volume of wire is .

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Q. The length of a wire is $2.17\, cm$ and radius is $0.46\, cm$. The number of significant digits in the value of volume of wire is ___.

Physical World, Units and Measurements

Solution:

The volume of wire
$=\pi r^{2} l=3.14 \times(0.46)^{2} \times 2.17 cm ^{3}$
$=1.4418\, cm ^{3}=1.4\, cm ^{3}$
Thus, number of significant digits in $1.4\, cm ^{3}$ is $2$ .