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De Broglie basically was saying that all objects in our world have a wavelength, but that the more massive the object, the smaller the wavelength. Essentially we can only observe the wavelengths of an object when it's tiny enough (ie an electron or atom). So when we're talking about a baseball and we're given a mass and a velocity, and asked to find a wavelength, we can use the de broglie equation (wavelength= planck's constant/(mass x velocity) ) to get the value we need. Honestly I've noticed that when questions ask for the wavelength of everyday objects (i.e. baseballs ) they're usually trying to ask for de broglie, so that's my tip off to try and see if the DB equation would help me. Hope that helped!
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