A value for the acceleration of free fall on Earth is given as (10+-2) m s-2. Which statement is correct?
Correct answer: A. The value is accurate but not precise
- A. The value is accurate but not precise
- B. The value is both accurate and precise.
- C. The value is neither precise nor accurate.
- D. The value is precise but not accurate.
Explanation
The 'true' value of the acceleration of free fall is 9.81 m s-2.From the value given in the question, the acceleration of free fall can be from (10 -2 =) 8 ms-2 to (10 + 2 =) 12 ms-2.The true value (= 9.81 ms-2) lies within the range given by the uncertainty, and therefore the stated value is accurate. Precision deals with how small or large the uncertainty is. A precise set of measurements would have a small scatter of readings. Here, the value is not precise as the uncertainty is large
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