Convert ‘450 pm’ into SI unit and write the answer in scientific notation upto 2 significant figures.

Answer

To convert '450 pm' (picometers) into SI units (meters) and express the answer in scientific notation up to 2 significant figures, follow these steps:

### Step-by-Step Solution:

1. **Understand the Conversion Factor**:
- 1 picometer (pm) is equal to \(10^{-12}\) meters (m).

2. **Convert Picometers to Meters**:
- To convert 450 pm to meters, multiply by the conversion factor:
\[ 450 \, \text{pm} = 450 \times 10^{-12} \, \text{m} \]

3. **Calculate the Value**:
- Perform the multiplication:
\[ 450 \times 10^{-12} = 4.50 \times 10^{-10} \, \text{m} \]

4. **Express in Scientific Notation**:
- The value \(4.50 \times 10^{-10}\) is already in scientific notation. However, we need to express it with 2 significant figures.

5. **Adjust for Significant Figures**:
- The number \(4.50\) has 3 significant figures (4, 5, and 0). To express this in 2 significant figures, we round it:
\[ 4.50 \rightarrow 4.5 \]
- Therefore, the value becomes:
\[ 4.5 \times 10^{-10} \, \text{m} \]

### Final Answer:
\[ 4.5 \times 10^{-10} \, \text{m} \]