What are the significant figures in the following measurements

Question

What are the significant figures in the following measurements?

(a) 1.009 m (b) 0.00450 kg
(c) $1.66 imes 10^{-27}$kg (d) 2001 s

{(a) 4 (b) 3 (c) 3 (d) 4}

Accepted Answer

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) $1.66 imes 10^{-27}$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.