Calculate the frequency and energy of a photon having wavelength 4000 Å

Explanation

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

### Step 1: Convert Wavelength from Angstroms to Meters
The given wavelength is 4000 Å (angstroms). We need to convert this to meters for our calculations.

\[ 1 \text{ Å} = 10^{-10} \text{ m} \]
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