Number of significant figures in `6.62 xx 10^(-34)`

Options

A. TWO
B. Three
C. Four
D. One

Answer

To determine the number of significant figures in the number \( 6.62 \times 10^{-34} \), we can follow these steps:

### Step 1: Identify the non-zero digits
In the number \( 6.62 \), the digits are 6, 6, and 2. All of these are non-zero digits.

### Step 2: Count the significant figures
According to the rules of significant figures:
- All non-zero digits are considered significant.
- Any zeros that are between significant figures are also significant.
- Leading zeros (zeros before the first non-zero digit) are not significant.
- Trailing zeros in a decimal number are significant.

In our case:
- The digits 6, 6, and 2 are all non-zero and thus significant.

### Step 3: Conclusion
Since there are three non-zero digits in \( 6.62 \), the total number of significant figures in \( 6.62 \times 10^{-34} \) is **3**.

### Final Answer
The number of significant figures in \( 6.62 \times 10^{-34} \) is **3**.

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