Question

C. Round off each of the following
quantities to three significant figures :
a. 1.43 cm b. 458 x 10 cm
e. 643 cm² d. 0.039 m
e. 6.398 x 10 km
f. 0.0179 g g. 79,000 m
*h. 42.150 i. 649.85;
j. 23.642.000 mm
k. 0.0041962 kg
11 following sum to appropriate​

Answer 1

Given that,

The following quantities to three significant figures,

(a). $1.43\ cm$

The significant figure is 3.

(b). $4.58\times10^{4}\ cm$

The significant figure is 3.

(c). 643 cm²

The significant figure is 3.

(d). $0.039 m = 0.0390 = 3.90\times10^{-2}\ m$

The significant figure is 3.

(e). $6.398\times10^{-3}\ km=6.40\times10^{-3}\ km$

The significant figure is 3.

(f). $0.01799\ g=1.79\times10^{-2}\ g$

The significant figure is 3.

(g). $79000\ m=790\times10^{2}\ m$

The significant figure is 3.

(h). $42.150=4.22\times10^{1}$

The significant figure is 3.

(i). $649.85=6.50\times10^{2}$

The significant figure is 3.

(j). $23.642= 2.36\times10^{7}\ mm$

The significant figure is 3.

(k). $0.0041962=4.20\times10^{-3}\ kg$

Hence, This is the required answer.