Question

The diameter of a wire measured to be 0.0250 x 10-4 m. The number of significant figures in the measurement is
five
four
three
nine​

Answer 1

Explanation:

The diameter of a wire is measured to be 0.0250

m. The number of significant figures in the measurement is five

Answer 2

Answer:

The answer is nine.

There are nine significant figures in the given measurement.

Explanation:

• The number of digits in a value which contributes the degree of accuracy of that value.
• The counting of the significant figure were started from the first non zero digit.
• If the zero occurs between the non zero digit they are said to be significant.

Rules to find out the significant figure:

1. All non zero digits are significant.   Example: 785 - 3 significant figure
2. If the zero was found between the two non zero digit they are also significant.    Example :  15.708 - 5 significant figure
3. If the zero found left and right of the decimal point of the non zero digit. The zeros are not significant.   Example : 0.00785 - 3 significant figure
4. The zero which present on the right of the decimal point are significant.Example :   40.00 - 4 significant
5. After the decimal point, the zeros which are present next to the non zero digits are said to be significant.   Example  : 0.0079800 - 5 significant figure .
6. If the values are from the measurement and the zero which are present on the right of the last non zero digit are found tho be significant. Example : 2090 m - 4 significant figure.

Given,

• 0.0250 × $10^{-4}$ m
• It can be written as 0.00000250 m
• According to the sixth rule the number of significant figure in the given diameter was found to be nine. Because the given value was the diameter of a wire which has been measured.

So, the correct answer is nine.

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