Q. 83.9( 13 Votes )

You measure two q A. 1.4 m ± 0.4 m

B. 1.41m ± 0.15 m

C. 1.4m ± 0.3 m

D. 1.4m ± 0.2 m

Answer :



Let



Let be the error in X.


From error analysis we know that,


(For the formula part refer to


NCERT class 11 part 1 unit


and measurement chapter)


Putting the known values we get,





In dimensional analysis, in multiplication the answer is rounded off to the same number of significant figures as possessed by the least precise term used in the calculation. Here 0.1 has least precision and has 1 significant figure. Therefore,


(By rounding off to one significant figure)


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