The value of Planck's constant is `6.62618 xx 10^(-34)Js`. The number of significant figures in it is

Options

A. 6
B. 5
C. 3
D. 34

Explanation

To determine the number of significant figures in the value of Planck's constant, which is given as \(6.62618 \times 10^{-34} \, \text{Js}\), we can follow these steps:

### Step 1: Identify the digits in the number
The value of Planck's constant is \(6.62618\). We will focus on the digits before the scientific notation part (\(10^{-34}\)).

### Step 2: Apply the rules of significant figures
1. **All non-zero digits are significant**: In the number \(6.62618\), all the digits \(6\), \(6\), \(2\), \(6\), \(1\), and \(8\) are non-zero.
2. **Leading and trailing zeros**: There are no leading zeros in this number, and since there are no zeros at the end, we do not need to consider any zeros for significance.

### Step 3: Count the significant figures
Now, we will count the significant figures:
- The digits \(6\), \(6\), \(2\), \(6\), \(1\), and \(8\) give us a total of 6 significant figures.

### Conclusion
Thus, the number of significant figures in the value of Planck's constant \(6.62618 \times 10^{-34} \, \text{Js}\) is **6**.

### Final Answer
The number of significant figures in Planck's constant is **6**.

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