There Are Other Ways of Expressing Uncertainty Besides Significant Figures

question 30

Multiple Choice

There are other ways of expressing uncertainty besides significant figures.For example,suppose a quantity is known to have a value between 20.4 and 20.0,and our best estimate of the value is midrange at 20.2.We could write the number as 20.2 +/− 0.2 and say that the number has a 1% uncertainty.We would also say it has 3 significant figures.If we square a number with 1% uncertainty and 3 significant figures,what results?

• A)A number with 1% uncertainty and 3 significant figures.
• B)A number with 2% uncertainty and 3 significant figures.
• C)A number with 2% uncertainty and 2 significant figures.
• D)A number with 1% uncertainty and 2 significant figures.

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