Question

Why we do not observe de Broglie wave in daily life?

Answer 1

de Broglie wavelength for a particle is given as,

$\lambda =\frac{planc{k}^{\prime }sconstant}{momentumofparticle}$

For daily-life macroscopic objects, this value is very very low, hence those objects don't appear to be performing any noticeable wave-like behavior.