The wavelength of light is 479 nm. What is its wavelength in Å ?

Options

A. 479
B. 4.79
C. 4790
D. 47.9

Explanation

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:
\[ 1 \, \text{Å} = 0.1 \, \text{nm} \]
This means that 1 nanometer is equal to 10 angstroms.

2. **Write the Given Wavelength**:
The wavelength of light given in the problem is:
\[ \lambda = 479 \, \text{nm} \]

3. **Convert Nanometers to Angstroms**:
To convert the wavelength from nanometers to angstroms, we can use the conversion factor:
\[ \text{Wavelength in Å} = \text{Wavelength in nm} \times 10 \]
Substituting the given value:
\[ \text{Wavelength in Å} = 479 \, \text{nm} \times 10 \]

4. **Calculate the Result**:
\[ \text{Wavelength in Å} = 4790 \, \text{Å} \]

5. **Final Answer**:
Therefore, the wavelength of light in angstroms is:
\[ \boxed{4790 \, \text{Å}} \]