A student has measured the length of a wire equal to $0.04580 m$ . This value of length has the number of significant figures equal to

five

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four

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six

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None of these

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Solution

The correct option is B
four

Explanation for the correct option:
In decimal number, the $0' s$ occurring to the right of a decimal point and before a non-zero digit is significant.
After a non-zero digit, $0' s$ are not significant.
The decimal number is $0.04580 m$ .
Thus there are four significant figures in the given decimal number.
Hence, option (B) four is the correct answer.

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