1 nano metre (1 nm) is equal to

Options

A. `10^(-7)`m
B. `10^(-9)` m
C. `10^(9)` m
D. none of these

Answer

To solve the question "1 nanometre (1 nm) is equal to," we will follow these steps:

### Step-by-Step Solution:

1. **Understanding the Unit**:
- A nanometer (nm) is a unit of length in the metric system. It is commonly used to measure things at the atomic and molecular scale.

2. **Definition of Nanometer**:
- The prefix "nano-" means one billionth (1/1,000,000,000) of a unit. Therefore, 1 nanometer is equal to \( 10^{-9} \) meters.

3. **Conversion**:
- We can express this mathematically:
\[ 1 \text{ nm} = 1 \times 10^{-9} \text{ m} \]

4. **Evaluating Options**:
- Now, we need to check the options provided in the question to see which one matches our conversion.
- Option 1: \( 10^{-7} \) m (Incorrect)
- Option 2: \( 10^{-9} \) m (Correct)
- Option 3: \( 10^{9} \) m (Incorrect)
- Option 4: None of these (Incorrect)

5. **Conclusion**:
- The correct answer is that 1 nanometer is equal to \( 10^{-9} \) meters, which corresponds to option 2.

### Final Answer:
1 nanometer (1 nm) is equal to \( 10^{-9} \) meters.

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