# A question on wave-particle duality

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Electrons are said to exhibit wave-particle duality because depending on the method of observation it acts as either a particle or wave.

But according to De Broglie waves: A particle of mass,m, moving with velocity,v, acts like a wave of wavelength,$\lambda$. Where $\lambda = \frac{h}{mv}$.
But if this is true, then why doesn't everything exhibit wave-particle duality?

AFAIK everything does. as m increases $\lambda$ is smaller.