E = hf

E = Energy 
h = Planck's Constant (6.626 × 10^-34 m^2 kg/s)
f = Frequency

Article:
https://en.wikipedia.org/wiki/Photon_energy

Video: 
https://www.youtube.com/watch?v=Zqt3btS1FwE

What is the equation for the Energy (E) of a wave (or photon) in terms of Frequency (f)?

The 100 Most Essential MCAT Equations (Free Trial)

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The 100 Most Essential MCAT Equations (Free Trial)