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Hi! I'm pretty sure that E=hv is a universal equation that works whether the electron is emitted or incoming, but many problems phrase it as an incoming electron because that is how it is perceived to monitoring devices in a lab.
I agree! One way to think of it is that photons do not have a mass, which is why you have to use those equations. On the other hand, electrons/neutrons/protons are particles and have a mass, so they can be expressed through the De Broglie Wavelength function(Has a mass in the denominator)!
Would the question have to explicitly state that we are solving for the energy of incoming photon in order to use c=lambda(v) ? Is there another key word that would point to using an equation for a particle with no mass?
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