Significant Figures (multiplication)
Mediumphysics
Compute (3.42 × 2.1) keeping correct significant figures.
Select the correct option:
Solution
Incorrect! Answer:
7.2
- Multiplication Rule: In multiplication or division, the final result should be rounded to have the same number of significant figures as the factor with the fewest significant figures.
- Analyze Factors:
- 3.42 has 3 significant figures.
- 2.1 has 2 significant figures.
- Raw Calculation: 3.42×2.1=7.182.
- Rounding: The result must be restricted to 2 significant figures.
- Final Result: 7.182 rounds to 7.2.
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About This Question
- Subject
- physics
- Chapter
- physics and measurement
- Topic
- significant figures (multiplication)
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
7.2
- Multiplication Rule: In multiplication or division, the final result should be rounded to have the same number of significant figures as the factor with the fewest significant figures.
- Analyze Factors:
- 3.42 has 3 significant figures.
- 2.1 has 2 significant figures.
- Raw Calculation: 3.42×2.1=7.182.
- Rounding: The result must be restricted to 2 significant figures.
- Final Result: 7.182 rounds to 7.2.
This medium difficulty physics question is from the chapter physics and measurement, covering the topic of significant figures (multiplication). It appeared in the 2025 exam.
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