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De Broglie's wavelength equation is used for particles and objects, such as electrons or a baseball, while the speed of light/Einstein equation is used only when calculating the wavelength or frequency of light. C=λv can't be used with particles because it describes a relationship with light. This is an important—yet often unrealized—distinction. I messed up on the last test by using E=hv and C=λv to calculate the wavelength of an electron, when De Broglie should've been used. Hope this helps!
λ=h/p (Broglie wavelength) is used when you need to find the wavelength of a particle (e.g. an electron) with a certain speed. On the other hand, E=hc/λ is used to find the wavelength of a photon of a certain energy
The Einstein equation can only be used for photons, while the De Broglie equation can be used for anything.
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