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Question

The radius of a thin wire is 0.16 mm. The area of cross-section taking significant figure into consideration in square millimeters is?

A
0.0804
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B
0.08
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C
0.08
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D
0.080384
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Solution

The correct option is B 0.08
Area=πr2=π×0.162=0.080384
Since final answer should contain same number of significant figures as in question.
0.16 has 2 significant digits
So, answer should also have 2 significant digits.
So, the answer is 0.080 mm2

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