Objects don’t have wavelengths, only waves do. Waves can move through physical mediums (like ripples through water), or they can be part of a phenomenon like electromagnetic radiation — where the wave is a sort of physical effect that drives its own motion and does not have to be travelling through anything at all in order to move. In either case, the wavelength is the distance between two peaks (or two troughs), ie. it is the smallest repeating unit of a wave.
If you meant what is the **wavefunction** of a physical object, well…. that’s a whole different thing which is firmly within the realm of quantum physics.
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