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I don't think the question would directly tell you to use this equation, but I know when we lectured about the photoelectric effect, this equation was required to complete the worked example. So if you have those notes, I would take a look back at those! We also reference this equation when we derived the De Broglie Equation as well.
Additionally, the question would have to be dealing with electromagnetic radiation, not electron wave properties. A question relating to the latter would likely use the De Broglie equation or Schrodinger's wave function equation.
The equation is used when referring to the energy of light/electromagnetic radiation, not with matter. v refers to the frequency of the light; if the problem gives you wavelength, you can use to find that frequency. Then you can use Planck's constant to find the energy of the particle. Alternatively, if the energy is given, the E=hv equation can be used in reverse to find the light's frequency.
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