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De Broglie wavelengths are used for large particles as well as anything that has rest mass. You'll know when to use it based on the parameters given; for instance, if you are given mass, velocity, momentum, or wavelength, you can predict that you'll have to use De Broglie because the other equation uses joules and frequency/wavelength.
De Brogile equation is used for any object with moment and wavelength, so in reality it could be applied to almost all scenarios although it would be pointless if it used on an object with a large wavelength.
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