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What are the numbers of significant figures in 23.023, 0.0003, and 2.1 × 10⁻³, respectively?
- 5, 1, 2
- 5, 1, 5
- 5, 5, 2
- 4, 4, 2
Correct answer: 5, 1, 2
Solution
The number 23.023 has five significant figures because all non-zero digits and the zeros between them count. The number 0.0003 has one significant figure, as leading zeros do not count. Lastly, 2.1 × 10⁻³ has two significant figures, as only the digits in the coefficient are counted.
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