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E is energy in Joules (J) or Electron Volts (eV).

h is Planck's Constant. When using joules, Planck's constant is 6.63*10^-34 Joule*seconds (J*s). When using electron volts, Planck's constant is 4.14*10^-15 electron volt*seconds (eV*s).

f is the frequency of light in inverse seconds or 1/second

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Q: What are the units of h in the equation E equals hf?
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