How to calculate the energy of a photon given wavelength

In calculating the energy with a given wavelength, just use
the Planck’s Equation. First calculate for the frequency using the wave
equation. Just divide the speed of light which is 3×10^8 m/s with the given
wavelength (705×10^-9 m). Then multiply the frequency with the Planck constant
which is 6.63 x10^-34 J. The answer would be 2.82×10^-19 J.  

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