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You use Einstein's equation to the find energy of a photon using E= hv. De Broglie's equation, lamda = h/mv can be used to find the wavelength for a particle with a particular mass and momentum. This De Broglie's wavelength can then be used to find energy using the equation E=hc/lamda. Einstein said that LIGHT is both a wave and a particle while De Broglie extend this wave-particle duality by saying ALL waves are particle and ALL particle are waves.
You should know how to derive De Broglie by using c = wavelength*frequency, momentum= mass*velocity, Energy=momentum*speed of light, and E=h*frequency. One of the equation s needed to derive De Broglie IS the Einstein equation. Hope this helps!
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