The multiplication product of 20.21 with 20.22 upto four significant figures is
Correct answer: A. 408.6
- A. 408.6
- B. 408.64
- C. 408.6462
- D. 409.0
Explanation
To solve this problem, multiply 20.21 by 20.22 to get approximately 408.6442. To express this result with four significant figures, round it to 408.6. Option A is correct because it uses four significant figures. Option C is incorrect because it does not round the result and exceeds four significant figures. Option D rounds the result to a whole number, which doesn't meet the requirement for four significant figures.
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About Errors and Significant Figures
Measurement errors include random and systematic effects, absolute, fractional and percentage uncertainty, and the precision shown by significant figures. Questions apply rounding rules and uncertainty propagation in addition, subtraction, multiplication and division, while distinguishing accuracy from precision and uncertainty from an actual mistake.
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