The number of significant figures in 0.0005042 is

Options

A. 7
B. 4
C. 5
D. 2

Answer

To determine the number of significant figures in the number 0.0005042, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Given Number**: The number we are analyzing is 0.0005042.

2. **Understand the Rules for Significant Figures**:
- Leading zeros (zeros to the left of the first non-zero digit) are not significant.
- Any non-zero digits are always significant.
- Zeros between non-zero digits are significant.
- Trailing zeros in a decimal number are significant.

3. **Analyze the Given Number**:
- In the number 0.0005042, the leading zeros (0.000) are not significant.
- The first non-zero digit is 5, followed by 0, 4, and 2.

4. **Count the Significant Figures**:
- The significant figures in 0.0005042 are 5, 0, 4, and 2.
- Therefore, the total number of significant figures is 4.

5. **Conclusion**: The number of significant figures in 0.0005042 is 4.

### Final Answer:
The number of significant figures in 0.0005042 is **4**.

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