The energy of a photon:

$\overline{){\mathbf{E}}{\mathbf{=}}{\mathbf{h}}{\mathbf{f}}{\mathbf{=}}\frac{\mathbf{h}\mathbf{c}}{\mathbf{\lambda}}}$

Where h is plank's constant, c is the speed of light, f is the frequency and λ is the wavelength.

h = 6.62 × 10^{-34} J/s

λ = 500 nm(10^{-9}m/1nm)

What is the energy (in eV) of a photon of visible light that has a wavelength of 500 nm?

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