First slide

Accuracy; precision of instruments and errors in measurements

Question

Subtract 0.2 J from 7.26 J and express the result with correct number of significant figures.

Moderate

A

7.1 J
B

7.06 J
C

7.0 J
D

7 J

Solution

Subtraction is correct upto one place of decimal, corresponding to the least number of decimal places. 7.26 -0.2 = 7.06 = 7.1J.

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