Which of the following quantities have three figures?

Question

Which of the following quantities have three figures?

(a) 3.0066 m (b) 0.00309 kg
(c) 5.05 imes10^{-27}kg (d) 301.0 s

{(b) and (c)}

Accepted Answer

Solution:

(a) 3.0066m

Zeros between significant digits are significant. Therefore, there are 5 significant figures in 3.0066m.

(b) 0.00309kg

Zeros used for spacing the decimal point are not significant. Therefore, there are 3 significant figures in 0.00309kg.

(C) $5.05 imes 10^{-27}$kg

Only the digits before the exponent are considered, thus there are 3 significant figures.

(d) 301.0s

Final zeros or zeros after the decimal are significant. Therefore, there are 4 significant figures.

Result:

Quantities (b) and (c) have three significant figures