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The energy of a photon is given by
where h is the Planck constant and f is the photon frequency.
We can find the photon's frequency by using the following relationship:
where c is the speed of light and
is the photon's wavelength. By plugging numbers into the equation, we find
And so now we can find the photon energy
We know that 1 Joule corresponds to
So we can convert the photon's energy into electronvolts:
where h is the Planck constant and f is the photon frequency.
We can find the photon's frequency by using the following relationship:
where c is the speed of light and
And so now we can find the photon energy
We know that 1 Joule corresponds to
So we can convert the photon's energy into electronvolts: