The energy of a photon can be calculated using the equation:
E = hc/λ
Where: E is the energy of the photon, h is Planck's constant (6.62607015 x 10^-34 J·s), c is the speed of light in a vacuum (2.99792458 x 10^8 m/s), and λ is the wavelength of the light.
Plugging in the values, we can calculate the energy of a photon with a wavelength of 445 nm:
λ = 445 nm = 445 x 10^-9 m
E = (6.62607015 x 10^-34 J·s x 2.99792458 x 10^8 m/s) / (445 x 10^-9 m)
Simplifying the equation:
E ≈ 8.865 x 10^-19 Joules
Therefore, one photon of light with a wavelength of 445 nm has an energy of approximately 8.865 x 10^-19 Joules.