What are the significant figures in the following measurements?
(a) 1.009 m (b) 0.00450 kg
(c) $1.66 \times 10^{-27}$kg (d) 2001 s
{(a) 4 (b) 3 (c) 3 (d) 4}
Difficulty: Easy
Solution:
(a) 1.009m
Since zeros between two significant figures are Significant, so there are 4 significant figures.
(b) 0.00450
Zeros used for spacing the decimal point are not significant. Hence, there are 3 significant figures.
(c) $1.66 \times 10^{-27}$kg
Only the digits before the exponent are considered so there are 3 significant figures.
(d) $2001^{s}$
Since zeros between two significant figures are significant so there are 3 significant figures.
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