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Which one of these is most accurate and which the most precise and alsoqlso why? ?? 1: 40m 2: 0.040m 3: 0.04m 4: 0.4m

Which one of these is most accurate and which the most precise and alsoqlso why? ?? 
1:  40m
2:  0.040m
3:  0.04m
4:  0.4m

Grade:11

1 Answers

Arun
25750 Points
3 years ago
Length
(l)
Least Count 
(Δl)
Relative Error 
(Δl/l)
(i) 
 4.00 mm
0.01mm
  
2.5× 10-3
(ii) 
4.00 cm
0.01 cm
2.5×103
(iii) 
4.00 m
0.01 m
2.5×103
(iv) 
 40.00 m
0.01m
2.5×104
Since the relative error in the measurement of 40.00 m is minimum, so this measurement is most accurate. The measurement 4.00 mm is most precise because it is measured with an instrument of minimum least count.

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