The number of significant figures in 30.00 m are

Options

A. 1
B. 2
C. 3
D. 4

Answer

To determine the number of significant figures in the measurement of 30.00 m, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Non-Zero Digits**:
- In the number 30.00, we first look for non-zero digits. The digits '3' and '0' in '30' are present, and '3' is a non-zero digit.

2. **Count the Zeros**:
- Next, we need to consider the zeros. In the context of significant figures, zeros can be significant depending on their position.
- The zero in '30' is not significant by itself because it is a leading zero in a whole number. However, the zeros following the decimal point (in '30.00') are significant.

3. **Consider Decimal Points**:
- Since the number is presented in decimal form (30.00), all zeros to the right of the decimal point are considered significant. Therefore, the two zeros after the decimal point are significant.

4. **Total Count of Significant Figures**:
- Now, we can count the significant figures:
- The digit '3' contributes 1 significant figure.
- The first '0' in '30' contributes 1 significant figure (as part of the number).
- The two zeros after the decimal point contribute 2 significant figures.
- Therefore, the total number of significant figures in 30.00 m is 4.

### Conclusion:
The number of significant figures in 30.00 m is **4**.

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