During the experiment, one measured the mass of mosquito and found it 1.20 x 10^-5 kg. The number of significant figures in this case is:
Correct answer: A. 3 s.f
- A. 3 s.f
- B. 2 s.f
- C. 5 s.f
- D. 8 s.f
Explanation
When determining the number of significant figures in a measurement, focus on the digits that are known with certainty and the first estimated digit. In this case, the mass of the mosquito was measured as 1.20 × 10^-5, with the digits 1, 2, and the exponent -5 being certain and therefore significant. The leading zero is not significant. Therefore, the correct answer is 3 significant figures.
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