How many significant figures are present in the measured quantity 64.00 s?

• A. 4
• B. 3
• C. 2
• D. 5

Answer: (A)

Verified step by step guidance

1. Identify the digits in the number 64.00 s. The number consists of '6', '4', and two zeros after the decimal point.
2. Recall the rules for significant figures: all nonzero digits are significant, zeros between nonzero digits are significant, and trailing zeros to the right of the decimal point are significant.
3. Since 64.00 has two zeros after the decimal point, these zeros are considered significant because they indicate precision in the measurement.
4. Count all the significant digits: '6', '4', '0', and '0', which totals to 4 significant figures.
5. Conclude that the measured quantity 64.00 s has 4 significant figures.