A value for the acceleration of free fall on Earth is given as (10 ± 2) m s–2.
Which statement is correct?
A The value is accurate but not precise.
B The value is both precise and accurate.
C The value is neither precise nor accurate.
D The value is precise but not accurate.
ANSWER: A
The Physics Behind
- Accuracy is the term used to refer to how close a measurement is to the true or accepted value.
- Precision refers to how close measurements of the same item are to each other.
- By stating (10 ± 2) m s–2, it means that
- the acceleration, 10 m s–2, is measured representing how close it is to the accepted value of g, and
- this acceleration can vary from 8.0 to 12 [± 2 m s–2] implying closeness of measurements when experiment / method of determining g is repeated.
- The above implies accuracy and precision respectively. Thus, the answer is B.
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