The wavelength of light is 429 nm. What is its wavelength in Å ?

Options

A. 429
B. 4290
C. 42.9
D. 4.29

Answer

To convert the wavelength from nanometers (nm) to angstroms (Å), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Conversion Factor**:
- We know that 1 angstrom (Å) is equal to 0.1 nanometers (nm). This means that 1 nm is equal to 10 Å.

2. **Given Wavelength**:
- The wavelength of light is given as 429 nm.

3. **Convert Nanometers to Angstroms**:
- To convert 429 nm to angstroms, we can use the conversion factor:
\[ \text{Wavelength in Å} = \text{Wavelength in nm} \times 10 \]
- Substituting the given value:
\[ \text{Wavelength in Å} = 429 \, \text{nm} \times 10 = 4290 \, \text{Å} \]

4. **Final Answer**:
- Therefore, the wavelength of light in angstroms is 4290 Å.