Calculate the frequency `&` energy of a photon of wave length `4000A`.

Explanation

To solve the problem of calculating the frequency and energy of a photon with a wavelength of 4000 Å (angstroms), we can follow these steps:

### Step 1: Convert Wavelength to Meters
The given wavelength is in angstroms, and we need to convert it to meters for our calculations.

- **Given:**
\[
\text{Wavelength} (\lambda) = 4000 \, \text{Å}
...