Which of the following quantities have three figures?
(a) 3.0066 m (b) 0.00309 kg
(c) 5.05\times10^{-27}kg (d) 301.0 s
{(b) and (c)}
Difficulty: Easy
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) $5.05 \times 10^{-27}$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
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