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1.Units, Dimensions and Measurement
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એક સાર્વજનિક ચોરસ બાગ, $(100 \pm 0.2)\; m ^2$ નું ક્ષેત્રફળ ધરાવે છે. બાગની બાજુની લંબાઈ કેટલી હશે?
A
$(10 \pm 0.01)$
B
$(10 \pm 0.1)$
C
$(10 \pm 0.02)$
D
$(10 \pm 0.2)$
Solution
Let the side length of the square park is 1 . The area of a square is given as,
$A=1^2$
$100=1^2$
$1=10\,m$
The error in length is given as,
$\frac{\Delta A }{ A }=2 \frac{\Delta l }{1}$
$\frac{0.2}{100}=2 \frac{\Delta l }{10}$
$\Delta l =0.01\,m$
Thus, the side of the park is $(10 \pm 0.01)\,m$.
Standard 11
Physics