Calculate mass equivalent of a photon of electromagnetic light with wavelength 750 nm.

Explanation

To calculate the mass equivalent of a photon of electromagnetic light with a wavelength of 750 nm, we can follow these steps:

### Step-by-Step Solution:

1. **Convert Wavelength to Meters**:
The given wavelength (λ) is 750 nm. We need to convert this to meters.
\[
\lambda = 750 \, \text{nm} = 750 \times 10^{-9} \, \text{m}
...